RE: Apache
CR wont be needed on the 84" hull. the V hull will run just fine especially with rudders behind each prop. the smaller 57" hull wont be better off with CR either. it a matter of preference and $ . both hulls will run well even if you dont cr. out the transom with the cables is fine.
I am assuming when u say the "rudders are behind the wheels" (like the bonzi or WHH drive are). if so dont worry about CR. If it were a cat, my answer would be different.
the single big motor would be an option. 14 hp to a gear and then to the drives. dont know how that compares to the $ being spent on the twins.
30 to 33% on the CG