Heh. With all the cars I've made, there are always design compromises you have to make to get them to work within Forza. The Ford GT in particular has a couple of areas that are difficult to work with. I'll talk about them here but if you have OCD you should probably ignore this part because I'm going to discuss some inaccuracies in the design I've made.
I don't want people to get the impression that I don't even consider these "errors" before releasing a design. I've done crazy things like completely warping a logo the reverse the car's warps.
1) The top of the rear bumper has to be painted by painting the from the top back of the car. To me this isn't a huge deal; I basically just painted the top black and ignored it. There is a black box at the back of the car but it is easy to dismiss. The big change is that the GT2 and arrow pointing to the tow hook don't start at the top of the bumper like in the real car. I made this decision because placing them in the correct spot would show up on the top of the car and I decided it would be too difficult to dismiss if it was a black box AND the top of some white boxes at the back of the car.
2) The GT has another zone along the fender flare that is a complete nightmare to work on. I've completely avoided these areas on the design which is one of the reason the FIKSE logo and PATENT.COM logo are in the incorrect places. I've also moved the EMCO logo on the rear flare (not shown in above pictures) because of the same thing.
It's a conscience decision on my part to relocate these things. In my mind, if the owners of these cars were contstrained to Forza's systems and they were putting sponsors on their cars, they would never let something like warped logos fly (and neither would their sponsors!). Note that I haven't resized the FIKSE logo at all, the area you can work in there is narrow but gets stretched out. I toyed with several solutions including making half of the logo more narrow than the other hallf but it just didn't look right so I made a compromise.
I hope you can understand and forgive me.