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Printing them (liquid resin type printer) is the easier part, Need a file generated for a each part.

STP was a solution of elastomer(rubber-like material) in oil - it essentially replaced the worn viscosity modifiers and increased the viscosity. It was made under contract for Andy Granatelli by a major oil company.

your tool reference confuses me, although I'm sure your measurements are as you say. A Vernier is a type of scale, a caliper is a type of tool. There are Vernier calipers, as well as dial calipers and digital calipers. I still use an old one in the shop.

"Bolt up" is not really the same as "fit."
You need to match hub diameter and wheel off-set as well as bolt pattern. Plus the backs are a tight fit,be careful with tire size.

my 41 is Philco

That was not an opening panel, it was a fixed piece of waterproof cloth. The newer technology to stamp steel roofs was displacing this older construction.

All materials used should be compatible with current ethanol-laden gas.

I agree that how you bond the rubber to the steel is not the major issue. if the visible pattern is the same as the underlying steel, like 41-2, you can look at spray up. When the underlying steel is flat and the pattern is in the rubber, it requires a substantial tooling investment to do it.

The compounds required are not that special, most are exterior EPDM in the appropriate durometer

The 42 convertibles and LWB cars use the 41 traditional bodies, so the 42 you show is the same as 41. The 46-7 flying lady is much harder to find than the 48-51 cormorant.

Some of Steele's products are contract manufactured, so Newbie you may know the manufacturers. I know Cadillac Rubber did some extrusions for them.