I got all the motor pods connected and running tonight. There's a bit of precession going on with a couple of them and I'm not exactly sure what's going on with that. It  could be a wheel or axle that is not mounted entirely flush against a hub or mount or something. I'm going to take them off this weekend and investigate. The important bit though is that I can command each motor pod individually and that all the time I've put into wiring and mapping out the pins and terminals and everything has paid off.  I flipped the switch this afternoon and all the wheels started rolling in the same direction at the same speed, first time off, which is HUGE.

I'm using 3 LM298N dual motor controllers, hooked up to an Arduino MEGA 2560 via screw-terminal shield.
That will ultimately be connected to a Pi or maybe even a Jetson that is running ROS.

For now though, I'm pretty psyched that I've gotten this far. Teleop control is just around the corner,  hopefully sometime in the next week or so, after I get the precession issues sorted.