Wow, thanks so much for the info and tips, I couldn't figure out the reason for the different set of tail lights. I also found the racingsportscars.com pages for all the chassis and I'm amazed to see how many slightly different versions there are for the front bumper on the early cars. I guess they were still experimenting with aerodynamics or just different cooling needs for different events?
As for diecast, that HPI model looks absolutely stunning. Given the rarity and probably high price I don't think it's likely I'll ever own or even see one up close. I just placed an order for the Harrods livery and can't wait. For fear of doing more bad than good, I don't think I'll tinker with the wheels at all.
http://www.racingsportscars.com/chas...o/GTR-02R.html