The real trouble is this. The custom tuner shops normally have a total set of different rules they have to play by vs GM.
While body changes and custom interiors do not appear that difficult to do so on an assembly line and control cost is not easy. Also the fact small body changes can be a big effect on a car anymore and mess up the numbers for CAFE. A hard edge here or there can be a number of Aero Count Drag numbers.
This is why GM works with these shops and will not void warranties on Callaway or other tuner cars they approve.
Not a big fan of that lime green.
Might note that even at the factory the choices of seats and colors may be at a all time high as is some of the exterior trim. I think there is much more to chose from now than we ever had in the past.
I saw a Z06 the other day and wow it is amazing. It makes the regular Vette look very mild. The added width really adds to the look.
Besides the Corvette has always been more a car the owners did the changes to it more so than shops. This has been and is more a car for the hands on folks vs the guy who sends his Ferrari to West Coast Customs.
With the volume and price of the Corvette that is just not a real option.
Corvettes are built much like any other assembly line. The main exception is the engines for the Z06 or ZR1. Those are done in a special engine center and at much lower Volumes.
You have to look at the cars that do offer these custom trim centers and most sell less than 10,000 cars a year and most are $200,000 or more.
Note GM is planning this for the new Cadillac Flagship. But it will be a very limited production car and $200,000.
To be honest GM did open the door on the number of color and trim combinations on the C8. I don’t thing the Corvette has so many combinations. Not many Cadillacs have had that many combinations.