Thanks Daniel. The truck you're showing in your pictures looks like a 2028-100. It was used in Geeps, Rectifiers, the EP-5 electric, and the later vertical-motored F3's.
I'm guessing it won't take 3 hours apiece once the work-flow is established ("learning curve"). Also there might be some economies to doing multiple truck blocks at the same time (batching.)
It seems like $50-60 would be a fair price to pay for this service in small batch production. Of course I would supply the trucks. Maybe I would consider paying more, but before I decide, I definitely want to know what the resulting gear ratio is. Thanks for sharing this mod on the Forum!!