Great pezz!! but you mean by 15-16 bodies used by the special colours you include even the special colours you have yet to put in the mod or the special colours you already added in previous versions?or these 15-16 bodies are still to add you mean? Sorry, didn't understand the last part very well.
About the unused RM's of the blue Mazdaspeed RX7 GTC '99, Kà, Primera (named as c-class touring) and Vectra are unused content which are already in the disc but were scrapped before release, while the files still remained alive.... To give you a more clear picture of what I mean:
https://tcrf.net/Gran_Turismo_2/Unused_Cars
And there you can see the unused RM's of the cars I listed, as some unused cars like the Elise
in this link site you can see all the unused content which I mentioned above, personally I wouldn't restore the Kà RM because it too similar to the RM already present in the game, but the RM of Vectra (it was in the demo of GT2 and cut at last moment), the RM of RX7 GTC '99 (even thought similar to LM RX7, i think it's still very cool RM, we would be very grateful if you manage to restore it) and the RM of the Primera (as you can see it's called as C-Class touring but it's basically a racing modification scrapped for the Primera) so these 3 RM's ( Kà is not urgent because too similar to what we already have), but the other 3 are very important IMHO and they really give a big flavour to the game, and in addition to what you want to add would be amazing, in good case scenario assuming if you manage to keep up with body slots and have left space at the end could you restore those 3 RM of Vectra, RX7 and Primera I mentioned above that you can see in cutting room floor? Please? just need 3 bodies for each
If you do it you are my hero xD There are 2 RM'S of Roadster too, would be great to see even them in future versions (of course if you manage and when will be possible, obviously
About the 16 special colours you mean the 12 special colours which you already added in the mod as we can see right away in logs, plus in addition another 4 special colours you plan to add in future versions, you mean? Or that the 12 special colours you added already occupy the slots freed by the removed shelby's and Exxon?? I'm confused
By the Vectra RM from the GT2 demo which was cut I mean these:
https://vignette.wikia.nocookie.net...est/scale-to-width-down/185?cb=20151119142158
I dunno if it's already in the game, because in this video of Seban (you probably know him, we are friends) you can see it right at minutes 4:18-4:20 you can see the RM Vectrra I mean and also RX7, Roadster, Primera and Kà RM'S I mentioned:
you can see there all hidden and unused content in the GT2 PAL disc, so then you have an idea of what to restore and add basing on these!
I hope I helped