First, I want to congratulate you on making it in the first place. That took a good amount of time to build, and it definitely took skills that I am lacking. Very well done.
What I like about the hilt:
Everything below the brass ring.
Everything above the brass ring.
What I don't like about the hilt:
The brass ring.
It's mostly personal preference on my part, but I like to have my hands higher up on the hilt, closer to the end of the emitter. It's simply how I trained to use a sword, and it's transferred over to lightsabers as well.
I'm guessing the brass ring is there to prevent your hand from being up on the threaded part, which would probably put small cuts into your fingers if/when the hilt turned in your hands. This denotes an eye towards functionality, which I highly approve of. Speaking of which, have you considered wrapping that threaded part in plumbers tape? I'm pretty sure they make it in different colors now, so if you were to build multiple hilts for different blade colors, you could use matching tape to easily tell which saber had which color blade.
I agree that the windows are a nice touch, and Red is an excellent blade color. Definitely should stay with Red.
Overall a job very well done, and something you should be very proud of doing.
I normally don't congratulate the darksiders or Sith on the site being a Jedi as I am
Whatever, you'll come around to a better way of thinking eventually