Just bought these bits.
All I need is the metal bits in the middle and I'll be good to go... :-)
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I'm thinking IRS, twin wishbone front with pushrod operated coilovers and something with a turbocharger. Maybe an R1 ? Under 500kg should be easily possible. It will definitely have 13" wheels :-)Here's an example of a built car with an R1 engine
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Mine will be longer wheelbase to better fit me.