Updated comments on Tourist Trophy series:
Cars:
Cobras–Most of the Cobras that ran were original 289 roadsters. These cars ran with the removable hardtops, both in period and Revivals. The Cobra Daytona Coupes ran in 1964. 3D printed chassis are available for these cars. A MRRC Cobra is listed in the rules, but this may be in error. The only MRRC Cobras that I am aware of are 427 Cobras, which are not eligible. If anyone knows of a MRRC 289 Cobra, please let me know.
Aston Martin–There are a number of eligible cars; all are resin and will likely be heavy. Most of these are set up to use an adjustable chassis, which is not particularly race competitive. Adapting a more competitive chassis would be advised. These would likely require effort to be competitive.
Corvettes–only C1 and C2 Corvettes are eligible; Grand Sports are not. I do not have a Ninco C1 and do not know what issues there may be. There are some 1:32 C1 and Stingray static kits available; unknown issues. Carrera Stingrays are also an unknown quantity.
Cheetah–As in previous posts, the Cheetahs are marginally eligible, unless it is discovered that the Carrera Cheetahs are larger than 1:32. The vintage Strombecker Cheetah would be eligible, but it is a pretty small car.
Porsche 904–The vintage Monogram is eligible, but it is a pretty narrow car.
Ferrari–There are a lot of eligible Ferrari cars eligible. The Racer Ferraris are too large and are not eligible. The only known plastic Ferraris are the Fly GTO and the Fly 250LM and the Monogram GTO 64. Both sidewinder and inline 3D chassis are available for the Fly GTO and only an inline is available for the Fly 250LM. The Slot.it GT40 chassis can also be modified to fit these cars as I showed in my How-To post: http://austinslotcarclub.com/fly-ferrari-gto-slot-it-converson-project/ Clearance is tight at the front of the 250LM and the GT 40 chassis takes a good bit of work to fit in this car. I have only seen inline 3D printed chassis for the Monogram. The other Ferraris are resin and will take more work to be competitive.
Jaguars–I built the Revell-Monogram Lightweight E-Type using a 3D printed chassis. The Lister-Jaguar is resin and would take work to be competitive.
Maserati–The Maseratis are resin and will take work
As I do not have all of the cars on the list, I cannot confirm that all of the cars have similar rear track width. If any of the cars have a clear advantage due to a wider rear end, it could be necessary to impose a maximum rear tire total width. If anyone has a Carrera car they would like to enter, please let me know the rear body width. And, if anyone has any question about a specific car, please let me know.
Good Luck!
Russell