if you want something light weight, fast and can hit a high rpm easily then for all means go with a rotary but the frame cant be entirely carbon fiber more or so the chassis would last longer if you used sq. tubing for it then everything else can be carbon fiber.
And a twin turbo rotary aka 13b-rew is'nt your best bang for buck if you want turbo either switch to a single turbo aka snail or re-do the entire twin turbo system since it is very friagle.