It's been a while since I've seen a Draft Lite - do the BB cups press in or thread in? If they thread in, you can replace it with any English threaded BB, whether square-taper, GXP, or otherwise. "JIS" is one of two versions of square-taper interfaces (the other being ISO). The BB you get depends on what crankset you'll be using. The Pake track cranksets use a 68X107mm English-threaded JIS square-taper.

Regarding wheels, you're not going to find a better deal than Velomine.