"Well, the main problem is that rotary's have a problem with torque production which limits the drive out of the corners."

All gasoline engines have torque problems or they wouldn't need a transmission, an inefficient klunky contraption of gears, bands, valves, and a lot of other complicated parts which can be remarkably reliable after a hundred years of development. OTOH, you want low end torque, get a compound or series wound motor and drive it from a generator driven by an engine at its optimum speed. You'll get all the low end torque you can stand.

Bullet proof? Nothing is bullet proof. I've met plenty of people who can find a way to wreck just about anything. And the most talented of them can do it on the first attempt without even trying. "Hey look at this part that just came off in my hand. What does that do?" "What happens if I push this button like this???? Oops! Sorry!!! Why didn't you tell me before it did that???"