The interior of the Carrera Corvette is flat plastic, but unnecessarily thick. I recommend .010″ white styrene sheet, which is what I used on the GTOs and Jaguar. First use some index card to get the necessary shape and then transfer it to the plastic. The Carrera dash can be cut level with the flat plastic. The seat tops, which are all that are visible in the Carrera, can be also cut flush and glued to the platform. I also recommend a double bend in the plastic which will add rigidity to the thin plastic. I don’t care much for typical lexan interiors as they just look like a blob (which can be improved with detail painting).
I also recommend retaining the original windshield as this is liable to get pressed upon during a race and should be rigid. Great care must be taken in cutting the windshield away from the rest of the “glass”. Using a razor saw, make sure to make very straight cuts without any side stresses. Clear plastic does not have the plasticizers that colored plastic does and is very brittle; it will crack. The side windows and rear window can be replaced with .010″ clear styrene. For the Porsche 935 I built from a wind-up toy, this is what I did. I used strip styrene superglued to the inside of the body to make a frame for the glass (make sure the super glue has dried before adding the clear, so it does not fog).
The Porsche had a complicated (and unfinished) interior with styrene interior door panels and a vacuum-formed hump in the middle that cleared the motor and chassis. I scratchbuilt the dash, mocking it up with index card first, then using a photo of the instrument panel.
