I'm absolutely ecstatic that this mod is being resurrected! If I can be a pain in the butt, I think that the one thing the sounds are lacking right now is that "crack" on the upshift, particularly on the external sounds. Other than that, this is exactly what this car needed. As far as the physics go, it's still a twitchy SOB to drive - which is exactly what it should be!
Great work bringing this car back. Personally I never knew it existed before for AC. As far as feedback goes I feel it needs to be a lot more compliant over the bumps. I was driving at Silverstone today and was struggling through maggots-becketts complex as it is quite bumpy through there. I don't know enough about suspension settings to get it where it needs to be but I did at least make some adjustments so I could set a reasonable lap time. When compared with the VRC MP4/22 that I also ran today, it's a lot more difficult to drive (yes I know that car has TC but not that relevant in this case I think). I was 8-9 seconds slower in the MP4-13 than the MP4/22 and I think this is mostly because I didn't have any confidence over the bumps. In real life (on the old layout of course) the difference was about 4 seconds.
Hope you, or the original modders, or both can come to some agreement to keep working on this as it's great!