I like how you think. Should be able to just superglue them together, right?
I actually have 0 experience with rotaries, that's why I chose it for this project. My requirements were that it was fast, noisy, and interesting. I figured that light of car, it should be fast with the added horsepower. 9,000 rpm should make some noise, and who doesn't want to see a weird engine in a tiny British car? The whole thing is going to be an exercise in ridiculousness.