I'm thinking of offering 9x12cm "snapshots" and 24x30cm "formals" as well, or maybe 18x24cm. Anyway I'll stick to the classic "metric" formats, and either sulfide-toned FB prints of gold-toned POP. Depends on how the negatives turn out, I guess...
The 9x12's are easy - I can do that with the old Speed Graphic, or with the even older Voigtländer Bergheil.
13x18cm and 18x24cm are easy too - Gandolfi's look traditional enough to satisfy even the most discerning vintage car owner.
24x30cm is even better - but the camera needs a new bellows. The one I have looks more like lace than leather.