John, this was one of the engineering samples from the MTH auction. It came incomplete, but with most of the parts needed minus the board and motor / drivetrain (which I've since procured). So that's why there's no cover over the switch ports yet (although I do have them).
Yes the charge port makes sense to me, should have thought of that. I've got a BCR for it, so I will just leave that hole alone. I think I've figured out most of the pins on the internal tender connection that we've been talking about. I'll share a photo / diagram of what I think is going on later.
Jeff
