I tried to do the radius slot at first, but without a mill, it was impossible to keep the cuts clean.
That particular motor isn't too intense. It is a 540 'L' size, or ~8mm longer than most car motors, but is about even in power. My neighbor won't be racing, strictly bashing, so we might go a little bigger and do a HUGE helicopter outrunner with a spur gear for a pinion.
On a side note, I don't get why the gas trannies are built so much stronger than electric. Electric cars have way more torque...
Great transmission in the GT2 though, one of my favorites.
Jon