Closer and closer with these damn covers. Made up a few prototypes now! You can see in the last pic the curves I have been tweaking a bit at a time to get them to match the frame.
I am also considering if/how these could be produced in scale. Injection moulding is obviously the preferred method and is how the originals are made. But the tooling costs would be astronomical - based on the fact they are quite large parts and would require slides in the tool. Sure, there are ways to simplify the design but then the covers would need to be an assembly, rather than a single part. It is also really difficult to gauge if there would be enough interest to justify such an investment! I'll mull it over for a good few months at least.