The Dude mount is Bomb, super tough and well engineered. You will NOT BEND it !
Using spur lower than 63 and a pinion 22T on down the mount will need a small mod to allow gearing varietys. It's a simple mod requireing a hack saw and metal file to allow the mount to be slid forward more. Takes 10 minutes and is super easy.
I'm running 64/18 with 4s and 5s and works great w/no heat issues with M.M.M.-2200kv
I retired from RC, now life is all about guns and long range shooting.