The issue you are going to crash into is that all of the cars are slightly different.
The last time I changed tonneau, (because I wore it out), I ordered a standard vinyl one from the factory and a local trimmer put in the studs to match the car. The last time I had a hood done, a local trimmer made it up using the old one as a pattern, but they wanted the car for a final fit.
Both Everflex and mohair have some give in them, so it takes a bit of care, (and experience I sadly lack), to tension them correctly first time.
