How about you invest that three million in a existing project. I have a bridge I could sell you, (near brooklyn.) I also have a patent for making snake oil without harming the snakes...
Here is Kenichi Yamamoto outstanding treatise on the requirements for a practical rotary engine. It gives you a good checklist for sifting bull****.
Don't underestimate the technical challenges inherent in materials compatiblity, sealing, lubrication and cooling. It took Mazda over a decade to take Felix's working engine to a reliable practical engine. It is very easy to produce horsepower - the challenge is doing so reliably.