Without any real knowledge on my part (so typical for an internet response) - you might want to ask the supplier for the run-out figures (both axial and radial) and guaranteed life of the bearings used. Those would be my main concern, and it's these mechanical (rather than electrical) characteristics which would influence the use of such a motor in this application.

Regarding the electrical side of things, you have to factor in a low-voltage DC supply at whatever power-level you anticipate, control system (stick with the RC controllers - they are designed for this), and heavy duty power distribution (cabling, connectors) as well as cooling systems (rough rule of thumb : for a given power, the higher current/lower voltage systems will have higher power losses in the form of heat).

I can't help but think that you're trying to re-invent the wheel here where solutions already exist, but you have my grudging respect to try this. I'd be interested in hearing how successful you are - particularly if you get the ATC working.