I actually looked at that briefly - well, not briefly, I studied it it through and through, with a 44 tonner and a GP7 LC+ loco opened up on the workbench in front of me.
I don't think I could do a conversion, even with all the tools and time I have: you need the tower drive with the flywheel sensors on speed on the motor, but powering those tiny little wheels. I think I could swap a LC+ diesel truck from a GP7 into a GP7, but its wheels are far too big.
But I think a factory could re-engineer it to work, with a single motor, and both the boards, installed very close together at the other end. Cooling for the two boards might be an issue.
MTH's will have PS3, which is, from a board and circuit standpoint, just as demanding of everything (i.e., you need a speed-sensor equipment motor and sound and control on boards, etc.). It will be interesting to see how they do it. Bet the inside is tight.
My two 44 tonners are running nicely, if always going to be challenged on power and traction. I'm content with them, although if I were going to add anything, it would be smoke.
BTW Gunrunnerjohn, I put my two (cow and calf) up on rollers to test them. There is far less rolling noise on rollers than on rails, and then I could really hear their sound. I can run the pair up to 18 V and the diesel engine noise is still just at idle on both: it never varies at all on mine, whether in neutral or running.