Prizm sound board questions.

I'm planning to build a pair of custom sabers using the Prizm sound board. This is the 1st time I've ever done anything like this so I'm trying to get as much information as I can before I start buying components. A friend of mine with a lot of experience in wiring circuitry is helping me, but he doesn't have experience with this particular type of technology. So if anyone else has experience with this, we'd love the extra input!

Here's a list of what features each saber will have:

Jedi sound bank with Jedi sound font, green blade color, and yellow FoC.
Sith sound bank with Sith sound font, red blade color, and yellow FoC.
Blaster deflection sounds triggered by secondary A/V switch (single, quick press).
Blade lockup sound triggered by main A/V switch (like Ultra Sabers products) or by secondary A/V switch (holding down).
Power indicator using an illuminated A/V switch and/or accent LED (lights up when kill key/charging port charger is removed).
Power on indicator using an illuminated A/V switch and/or accent LED (lights up when saber is activated).
Crystal chamber that lights up with saber is activated.
Illuminated pommel crystal.

Here are the questions I have at this point that he isn't 100% sure of either:

1. The Prizm manual has conflicting information on a power source. The Introduction has a yellow highlighted section that says this board is, "...designed to run exclusively on a single li-ion cell (3.7V)."
The Prizm Features & Maximum Ratings section says, "...SINGLE li-ion cells..."
However, the Wiring and Operating the Module section mentions using, "...li-ion battery packs made of 14500 18650 cells..."
My friend has advised me to go with the 18650 as it has triple the lifetim of the 14500, and it appears to handle more current so there's less risk of explosion. However, we aren't sure if we'll need more than 1 cell to power everything for a decent amount of time. He says that if we use more than 1 cell, then they should be wired in parallel and not series. So does anyone have experience in successfully wiring multiple cells in parallel with this sound board, or will a single cell be enough for all of this?

2. To achieve the aforementioned blade color schemes would it be easier (better on the power supply) to get an LED module with a green, red, and yellow LEDs pre-installed so that each sound bank only ever uses 2 LEDs? Or should we get a module with red, green, and blue LEDs, which we then program the color schemes (manual section Profiles vs. Standard Blade Color Definition)?
My friend says we can probably make it work either way. He's worked with incandescent light and filter gels but never anything as narrow-bandwidth as LEDs.