Hi,
Glad I can help! Although I did not try it with a NB V2 yet, it should work just as well. But to be sure I need to look into the manual. I recall the V2 has some Kind of FOC, well, although you can skip it, it might Need some consideration if you wanna use it (i.e. if you have a white die, you might want to use that on clash, but I guess the TriCree is called Tri cause it has 3 dice...). And yes, I did use Cree for this build, but any RGB will work. If you use the standard 3.7V battery, you only Need to consider a resistance for the red not to overdrive it too much. 1 Ohm might be a bit too daring, 2 Ohms more than enough.
It is also a good idea to design the hilt in a way that the potentiometers are accessible from the outside. That makes changing the colour much easier. With a PVC based saber hilt that should be not an issue,

Have fun and don't forget to post the pics!

As in the sommer I do not check Forums that often (being most of the time outside), please drop me a mail if I do not respond (kun.andras@yahoo.de)