Reminds me of the amatuer rocketers that build these huge (by comparison) 'skeeters powered by multiple clustered 1/2A Estes motors.
Clearly it's the build challenge rather than the final product that matters.
Personally, with rockets and motorcycles, I prefer big singles and twins.
this has been kicking around the net for a while. It's up there with the 48 cylinder kawasaki 2 stroke simon whitlock built in england (yes the 48 cylinders were overkill but he does build some nice stuff).
Simon's creation (the guy sitting on it is Rick Brett, Kawasaki triple parts legend here and in england):