Firstly Andi great review, I really enjoyed the read, It's good to get the view of somebody who's prepared to tinker, I hope your comments are taken on-board, because like you say it certainly is a good looking car, though I think I would have gone for the McLaren MP4/2C. I can think of plenty of members at our club who would completed the work you have, to get the car to run well almost as a matter of course, I think they'd probably switched it to a Slimline too.
Looking at the body mounting screws, do the protrude below the chassis that would effect it if you wanted to lower it so could they be counter sunk into the chassis? I'm sure that's something we'd have to consider...
I like the car though I'm just not sure its for me right now.