Some great dialogue & insight as to the numerous hurdles. Nobody is pretending it is going to be a walk in the park. If it were, I wouldn't be here because the system would already exist! Conversely if there were elementary show stoppers, by now the project would have ceased.
Many of the basic questions can be answered by spending 10 minutes on the web site.
From the preamble
System Overview
Introduction
WheelTug® is a fully integrated ground propulsion system for aircraft. Built into the hubs of the nose wheels, it will give aircraft of all sizes full ground mobility (forward & reverse with steering) without turbines or external tugs. It will not require airframe modifications. It will be powered by the Auxiliary Power Unit (APU) which, while technically a turbine, is designed for this sort of application.
To the:-
Join the team, Involvement can be full or part-time, and does not require relocation or frequent travel.