It's true, sports cars, especially older ones, really aren't made for big Americans. For that matter, have you ever sat in one of the WWII Willys jeeps? Jenny's uncle has a nice one, and the darn thing is made for tiny people. We must have gotten taller and wider since WWII -- a lot taller and wider.
I parked the Mini next to a Renault Gordini at a car show last year, and I asked the Renault guy if he'd ever had a Renault Alpine A110 because I've been off-handedly looking for one. He says "don't buy it until you've sat inside it". He said he could barely fit in his, and he's about 5'7"-5'8" and I'd guess around 140 pounds. And with the motor behind the driver, there's no such thing as moving your seat back. I'd probably need a sunroof so that when I put my feet on the pedals, I'd have a place to put my knees.