Max,
Watch out on the length of the Lipo batteries your looking at, anything longer than 3" is a tough fit, that's if you want your canopy to fit back on. My MegaPower 1350mah 15c packs just barely fit under the canopy (gotta jam it on), and they are about 2.75" long. Anything longer would have to be belly mounted, and that will throw off the center of gravity.
Did ya find that link for the Airwolf body? $30 bucks, I'd be willing to try a body-mod for that kinda money, (it could hide all the other damage I've done to the AXE).

Rick