I don't know where we are with this, if anything moved forward or not but I have been talking with my wife and I am about 99% sure I am going to start making t-shirts soon. I have wanted to do it for years and specialize in stuff just like this; smaller runs of old auto/gas & oil/motorcycle logos.
I'd like tot be able to offer more colors, can't be too much more difficult to print using multiple shirt colors as long as the ink colors will be the same. (Simplex logo would look good on black, green, white, etc shirts with the same color inks) They won't be as cheap as all one color because the minimums when buying the shirts wholesale but it isn't that much from what I have seen. Plus, I plan to do many different companies so I should be able to get decent deals and buy in bulk.
I'll get started as time allows and I am looking for used equipment now. I'm planning to do a lot of the old gas and oil companies. (odd stuff, long since out of business as well as the logod from the pump makers themselves) I'm sure once I'm up and running I'll be looking for cool old logos.
Anyway, just wanted to throw that out there. If nothing else comes of this thread I'll be doing Simplex shirts as one of my first batches. (maybe do a run of logos and a run of ones with the bike on it?) The screens aren't that big of a deal to make so once I am up and running it wouldn't be a big deal to have 2 designs .