Of which I'm glad, that there's actually a select few that he HASN'T managed to get.

An hour's worth of googling and intense brain searching got most of them done... but of the ones I haven't solved, there are a few that I feel I really should get. #6 and #27 do not ring any bells, but the others are right up my alley, age-wise and car type-wise.
I was also amused to realise which three-seaters you did
not put in there. I was convinced that there had to be a McLaren F1 in there somewhere, but unless #28 is some stripped-out racing version with a different steering wheel, I can't find one. Also, I missed the Citroën Karin and the Bizzarrini Manta. But there are some real nice ones in there!