i think just knowing your car is one-of-a-kind, is worth all the hassle of doing shit like this...if u really wanna put that enigne in there...don't ask, just fucking do it, that would be so sweet. Personally i think 510's are some sexy little cars, but practicallity is also a main factor in a daily driven street car. Did u think about a KA? or just build up like an L16, L18, or even like an L28? Maybe ur obsessed with Wankle, i don't blame you, but in the nissan forums, we like nissan engines. goodluck with whatever u end up doing.