if its your cup of tea then go for it - rotor's love to catch fire!
just bear in mind that an NA rotor makes about half the torque of a piston engine in the same capacity - an for it to make any power its going to be way loud - porting, exhaust / intake will easily smash 100db
turbo would be good.

nothing really different to any other engine conversion. all mounts custom - tail shaft etc.