Thank you, Brent. I'm hoping that by seeing the drawings for the assemblies, I'll be able to get the numbers (and then the drawings) for the sub-assemblies. Hopefully, I can get deep enough into the sub-assembly drawings to get enough sizes to make them myself. There is just no way I can justify spending $1200-1400 for a set of side curtains from one of the suppliers. And since my car will never be looked at by a judge, and I hopefully would never need to use them anyway, I think this is a way I can get something functional and not force my family to live on sparrows and rabbits for a month!
Even the final assembly drawings will give me an 80% solution on what I need for sizes of the components to make a set. It's just the final 20% that I want to narrow down.
Seeing your drawing, I'm curious to see how much difference there is between a 1928 and a 1931.