If you find the 200K + to build it, I will drive it for you
I wouldnt put a 4 rotor in, Id keep it simple, a NA PP 13b or a turbo'd REW.
Do what RE Amemiya did and hook that up to a Subaru Legacy gearbox, remove the tailshaft and use the output flanges that drive the front wheels on the subaru to drive the rear wheels.
So a mid engine 13b with a transaxle gearbox for literally pennies.
The RX8 suspension is tried and tested and known for being a good set up, so id nick that again like on the rotus.
I can build the chassis no problem and im confident now that I could build a complete car from home made moulds, could be a combo of GRP and maybe try carbon fibre.
Id have to polycarb all the windows, but im doing that on the rotus so that can be my dummy run.
As they say, every day is a school day.
Id still let you have a drive tho Clive. lol