Okay, you are someone, when is your first release?
Realistically, The 40s era stuff takes a lot of work to compete with the modern plastic and brass models. The detail is just not there. The walthers passenger cars can be made up into nice cars. But the rivet detail is crude compared to the GGD plastic. They do have the advantage of some specific models and GGD is limited to just a few. On the other hand, how many modelers still want models of heavy weight passenger cars?