Ok. MY Tx came extraordinarily fast. It even avoided customs, so it was really cheap. I managed to mix the channels so moving the stick up both motors drive in one direction, moving the stick down, they both reverse. When moving stick side to side, motors work in alternating directions, so I can steer on a dime. I will see if the need arises to lower the response of individual motors to simulate better steering.
I made the rear idler wheels, and now I have to tackle the front ones. They should be able to tension up the tracks, so they can't be fixed. I'll see will thgey be tensioned by screwing them or with spring loaded system like my old PMD has...Really cant make much progress until my tracks and sprockets arrive. Keep you posted...
The axles will be shortened when I see the exact track position.