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That is a good idea but buying anything newer than thirty years for a donor vehicle will make it an awful lot harder to maintain road-legaliness after the event.
I actually think my ideal donor might be a Honda Beat... it's a Honda and that's the drivetrain I want to use and it's mid engined so roughly speaking it's the same layout (in terms of tax and insurance after the event)...
In terms of everything else in pretty happy to start with a blank slate although I most likely will end up going for some sort of patchwork quilt of different tried and tested ideas rather than reinventing the wheels so to speak...
How about picking up an inexpensive Boxster- the 2.5 or 2.7, then building a chassis that mounts all the existing suspension and so forth, takes the stock engine, then you could skin it however you wanted?
Bonus points for converting to double-wishbone, but you can use McPherson strut in a tube chassis.