What do you think of my buggy project?

The main reason why i use the clutch setup is the fact that i want to keep the mechanical brake. And if i use the RCM motor mount for my RC8 or my Mugen, i the motor it the rear brake caliper. I must use a 20T + pinion, wich will give my more than 50m/h.
So the only way to keep mechanical brake for me is to use the RCM revo motor mount, but the revo motor mount should be place little behind/rear the rear center diff mount to clear the brake calipers, so the problem now is the stock motor shaft is not long enough to use a standard pinion and reach the center diff spur gear. The only way to extand the motor shaft is to use the Tekno eletri clutch setup. But if i don't like the clutchbell setup, the Tekno electri clutch have a 5mm shaft so i'll can use a standard pinion on it.