I am leaning to the plate mount w/spacers. I am building a scratch built, scaled down Giant Stinger and I think limited access to the back of the fire wall will make starting nuts on hard to see studs, a reason for too much profanity.[sm=eek.gif]
Although the stud idea is tempting. I am always looking for ways to save even a little bit of weight. I cut a hole almost the size of the crank case in my plate mount to save some weight.