Moving on!
8. The Reaper sounds cool too, but is it?
9. Does the Reaper's pommel really have a big hole in it?
10. Is there a way to plug this hole?
Yes, it's cool, yes, it has a big hole in it, no, I don't think there's an easy way to plug it, and no, I don't think you should plug it. (I know, you didn't actually ask the last question, but I answered it anyway.)
I love the Reaper; it too is on my want list. To me, the most interesting part is the pattern machined into the body. The pattern reminds me of a cross between a circuit board and the Nazca Lines (which are the ancient large drawings on the ground in Peru).
The saber is 15 inches long without the claws at each end, 19.5 inches with the claws. It is available in three colors; the standard Reaper is black, and the Crimson and Azure Reapers are the same red-orange and blue colors that I've mentioned earlier. In all three, the etched pattern is silver, the natural color of the aluminum. The hilts are largely a constant diameter, with exceptions that I'll mention below.
The emitter is slanted and body-colored, with the long part on the opposite side from the activation button. A bare aluminum claw extends down the blade from the long side of the emitter; it has four holes drilled across it and a scalloped outer edge. The slant is a straight line, about a 45-degree angle. There is a thin outline etched into the saber here, like a hint at the pattern on the rest of it; unlike the rest, this is body-colored rather than silver.
Immediately below the emitter are 5 rectangular windows evenly space around the body; the metal between the windows is slightly thicker, so that this area would be larger diameter than most of the saber if it were a full circle. Immediately below this is a silver section that is the widest part of the saber; it is widest at the top, tapers quickly down to a cylindrical section with four raised rings, then tapers down to the body's normal diameter. This would be a natural place for the upper hand for a two-hand grip.
Immediately below this is where the pattern starts. The activation button is here, inside a circle drawn by the pattern. The pattern extends down, around the Covertec wheel on the side, ending just above a silver ring that separates the body from the pommel. This area is all constant diameter, which allows the saber's unique pattern to be the center of attention.
Below the silver ring is the pommel. This, like the emitter, is a 45-degree slant with the long side at the back and a claw at the farthest point; on this end the claw turns away from the saber's centerline rather than toward it, and has three holes drilled across it and some scalloping on the outer side. As noted, there is no grille at the bottom of the emitter, just a hole.
...and here is why I don't think you should change the emitter. As designed, the emitter and pommel echo each other; the hole in the emitter matches the hole in the pommel if the blade is removed (like if you were carrying it). I think you are picturing the hole as detracting from the artistry of the saber, but in my opinion, it's an essential part of balancing the saber's lines and contributing a feeling of symmetry.
2. I'm curious about the Mallace, and what it looks like.
Can it be used without the claws?
Can some decorative screws be put in place of the claws?
Can the emitter be lined up with decorations on the hilt, and the power button?
The Malice looks like somebody decided lightsabers aren't scary enough and wanted his to be an axe as well. It's based on Darth Malgus's lightsaber; Malgus is a character in Star Wars: The Old Republic with both the power and the audacity to attempt to supplant the immortal Sith Emperor. Clearly not a lightsaber for the meek of heart... which is why it was pretty funny in that game when my sweet little healer-specialized Jedi Sage was using one like it for a while.

The standout feature of the Malice is, of course, the claws. The large versions are about 6 inches long, extending 5 inches up from the hilt; the small ones are around an inch shorter. (If somebody has more exact measurements, hopefully they'll chime in.) They are mostly black, with the edges silver to suggest an edge; however, they are not actually sharp. In answer to your question, they are held on with recessed screws, and I believe you could indeed put decorative screws there instead; again, hopefully somebody who actually has one can chime in. I don't think you could change the orientation of the emitter relative to the power button, but I again can't say for sure.
Without the claws, the saber is fairly straightforward. The bulk of the emitter is silver. There is a taper at the top of the emitter, then a black ring, a vertical black line on each side, and another black ring. On the lower ring is a button like on the Bellicose; it can again be red, green, blue, gold, silver, or bronze. Below this is a thicker black ring; then a silver section with a raised ring around three-quarters of an inch in width. This raised ring has small teeth, kind of like a gear. Below this is a black ring, then a silver ring; from here on down the saber is black other than activation button and pommel. There are four grooves around the hilt in this section; one near the top, a large area where the activation switch is, then the other three below that. Unlike grooves on most Ultrasabers, they sort of curve in. The best way I can think of to describe it is looking like marshmallows stacked on top of each other. (Except, you know, EVIL marshmallows.)
Damn, now I want some marshmallows.
The activation button is one of the standout features of this saber, possibly literally. In addition to the normal options of guarded switch or anti-vandal switch, you can also get a raised activation box. The box can be either silver or black. It appears from the options that the switch might only be able to be silver, but you might ask Ultrasabers if you could get a black one if you wanted. Notably, this is one of the few sabers where you can get an AV switch on a stunt saber. Also notably, this is not in line with the decorative button above; instead, it is below one of the two claws--it is on the left side if the saber is sitting on a table with the claws parallel to the table's surface.
Below the switch, as I noted, are three more grooves, and finally the pommel. There are three options for pommels on the Malice. One is all silver; it is shaped roughly like a box with the top mounted to the saber, a gear tooth protruding out from each side edge, and an octagon on the bottom with three slits in it for sound. Another is similar except that it is all black other than silver gear teeth. Finally, there is a more conventional mostly round pommel; it is vaguely similar to the Bellicose pommel, but more rounded and with slightly more complex decorations. I've tried to figure out how to describe them, but any description I've come up with is confusing even to me! Suffice to say that it is not a plain-looking pommel but is more subdued than the other options. If I were going to use a Malice without the claws, I'd get this third pommel design.
4. What does the Prophecy look like?
The Prophecy is passingly similar to Anakin's first or second sabers or Vader's saber; however, it is far from an exact replica of any movie saber. I've heard it described as Ultrasabers' first attempt at a saber in those styles, when their machining capability was still limited; whether that is actually true, I don't know. At any rate, it is reminiscent of the sabers mentioned, but much simpler. On the plus side, this simplicity probably makes it more comfortable to wield than the movie sabers.
The saber uses two diameters, which I'll refer to in the description as "thinner" and "thicker". The emitter starts as "thinner" and the body ends as "thicker". I don't have a Prophecy (yet!) so I can't tell you exactly what diameters these are, but the description mentions 1.45 inches as the width at its widest point. Overall length is is 11 inches, and the saber is available either as all silver or all black.
So, we start with a 45-degree slant on the emitter. Below this is a thicker section. On the back of the long side of the emitter are two brass knobs; these are the retaining screws for the blade, rather than the typical recessed setscrew. One of these is in the thicker section, one is above that; it's actually located where the slant starts on the opposite side. On the next section, which is again thinner, there are two small circular windows on the left side (looking at the activation-switch side, which is opposite the long side of the emitter). Interestingly, there are no matching windows on the right side. This section is a bit over two inches long, and would be a comfortable place for an upper hand. Next another thicker section, which is where the activation button is. Below that is a thinner section, about an inch long. Finally, the rest of the hilt is a thicker section. This has six longitudinal grooves in it; between two of them on the right side is a Covertec knob in the same color as the rest of the hilt. Finally, the pommel is a simple knurled disc, recessed slightly into the hilt. The Prophecy is MHS-compatible, so you could use other pommels, but I don't know if there are any that don't work because of the way it's recessed.
One more thing to note about the Prophecy is that it's a v3. Therefore, it can have Emerald or sound, but not both.
I use to have an Anikan saber as a kid, and later found out that the details on it were mostly wrong. It had some details changed for safety reasons. Some people say the Anikin saber from Episode 2 was a smaller more Jedi version of his Darth Vader saber. Although the toy version was larger than the Darth Vader version.
I know you had this as part of the previous question, but I felt like addressing it separately. All three of Anakin's sabers have similar design elements, such as the slanted emitter and the ridged grip near the base. Anakin's first saber does use a straight bevel on the emitter, like Vader's saber and unlike Anakin's second saber. However, I wouldn't actually describe it as a "more Jedi" version of the Vader saber; merely as one clearly in the same style. It is true that his first saber is smaller than the following two; the reason for the Vader saber's size is supposedly his cybernetic hands, while I'm aware of no in-universe explanation for the larger size of his second saber. (The real-world explanation, of course, is because that's how big 3-cell flashes were, while the Attack of the Clones saber was custom machined.)
For the record, there is no actual Ultrasaber version of Anakin's first saber. The Prophecy does have some strong similarities, and you could make it into a close facsimile without too much effort, but it wouldn't be a perfect replica, or even as close as the Ultrasabers Graflex and Chosen One are to their respective movie versions.