Back to the OP's question:
If I had unlimited funds for an ebike shop to build bikes for people, I'd buy this house and lot (for me and the dogs), and the one nextdoor to the west for the building of stuff (it has a nice big (relative to bicycles) tall garage/shed with it's own powerpanel already on it, separate from the house there, and a nice empty yard I could just take the fence down between mine and that one, so the dogs can have more to explore and be security for both of them.
I'd do bicycle-class custom cargo vehicles for people, especially those willing to trade in the typical car/truck lifestyle for that of a cargo-biker (even if they keep their big vehicles for those instances that don't suit or allow for cargo-biking for whatever reason).
I'd have a bunch of "standard" types I could easily build up from existing parts and jigs, and people could bring in their own designs for me to build (or help them redesign for better practicality).
All designs, including those others bring in to be built, would become part of the pool of designs for others to pick from, because if an idea is good, why not spread it around?
If someone doesn't want anyone else to have any part of their design, then I guess I wouldn't be able to help them build that. But I expect most would be fine with the idea.
It'd be word-of-mouth, not a storefront with any kind of regular hours, so it'd take off slow most likely. But it would let me take care of the dogs and myself, and do the stuff I really like to do, while hopefully making enough money to survive on, and helping others at least try out the cargo-biker lifestyle.
It'd be nice to deck out the shop with all sorts of fancy tools, but really just having powered versions of assorted tube cutting/bending/etc tools, axle/bearing/etc press, drill-press, lathe, and so on, would probably be enough for most things.
Optional:
A CNC setup capable of doing various metals would be nice, for repeating parts used on various designs (preferably with some sort of 3d-scanner that would "copy" a part I'd worked out the shape of via experimentation as I am not so great at putting that kind of thing into the computer as 3d-models anymore).
A 3d-printer for plastics would be helpful, for covers and doodads and stuff.
A big vacuform machine would also be useful for fairings and/or plastic fenders and things.
But...I expect that most of these custom vehicles would be way out of any typical person's budget, much less desire, if I had to earn a profit from it all to pay for the place itself and me and the dogs to live off of too.
So if I did this, I'd want to be able to offer stuff to people liek me that could never really afford to buy these things...costs of those vehicles offset by others who *could* afford to pay the full cost of something like these things (which I epxect would be a few thousand dollars each, at that point).
