Hmmm more than one, thats is something to think about!
Mike, I think you can maximize this by - again - keeping the logo constant. In fact, you could have your shirts with a simple embroidered logo on the chest, and from those shirts, create silkscreens for whatever vehicles you want to do.
And then look at sponsorships. M/T Tires might well spring for the initial silkscreen and set-up costs for the Challenger Shirt, and might be convinced to sell them on line with their tires. Synergies for the museum and the product.
If you were to do the same thing with the three MG Factory experimentals from the 1950s ( the EX 135, EX 179 and EX 181 - all on one shirt), I'd hazard a guess that Moss Motors might sign on and sell them through their web presence.
While most of the teams are independent, there are likely some sponsors who might want to associate themselves with an achievement after the fact.
Put the sponsor's logo on the shoulder.
The sponsor gets visibility at the museum and product to sell along with supporting a not-for-profit educational facility.
I think there's potential there.