Shaflts are simple, flux cans are based on standard DOM tubing sizes & easy to cut to any length. A bearing carrier & motor mounting are also easy & afordable parts....only real decision is whether a skirt bearing is enough benifit to justify the additional parts required on a 50mm motor. (prolly would be required for a 100mm length stack)
I have contacts in several small cnc houses in the area...manufacturing is not the problem. Its getting a reasonable amount of the correct materials in hand....& then finding the capital to finace a run of motors.
Its the reason I am such a DIY guy....I allways have more time than funding for projects. It is far better for me to photo etch a batch of stators for myself & maybe a couple motors...but that is nothing like running a batch of 10 motors.
For compairison & to get back to motor design parameters here is some additional info
The C80/100 is only a 52mm stack in length & the magnets are only 50mm in the can.
the 80/85 has a 34mm stack & magnets
the closest motor for direct compairison will be the CA120.
A CA120 has only a 30mm stack & magnets.
The 18t 16p Miles proposed (I like it too) is bigger, with fewer poles. it ought to be the Nutz for a starting platform. With a 50mm stator stack its going to be monster. I have nothing to judge it against If we stack it to 100mm in length.....but I would sure like to try it
& if its anywhere near controllable, I have an "oil mist" active cooling system all designed ready to impliment for some serious BTU disapation if we decide to load it into "semi efficancy"
here are some teasers of the gear pump parts: