Yes, it did hold the motor, conducted power to the brushes, and generally provided weight. I'll attach a couple of (poor) pictures to show what I did - a lot of bashing, not much pug, I think you'll agree. Much of this may be relevant only if one is using the old split chassis J72, I have no idea what the new one is like (though I trust the cab's not full of motor) and I'll be tempted to get one when this all stops working. My comments relate only to the old J72 chassis. Wheelbase is right but it's too long overall for a 330 (I imagine also true of new Bachmann J72 chassis?!), so I had to shorten in front and back. In the process of getting an empty cab, necessitating moving the motor, I had also to lose the rear bolt that holds the chassis halves together and contrive a new fixing, down between the rear wheeels I think; and to get light under the boiler, the reversed motor had to be mounted diagonally on a bed of plastic (!) and those bits of brass you see in the pictures sprung in place to form the electrical connection from pickups to motor. It looks horrible but runs better than I deserve. I don't profess to be an engineer and now you can all agree: I was aware of many shortcomings in the adaptation, digital photography mercilessly shows more, and only that lumpen bit of chassis under the footplate can be attributed the bashed origin... other faults are entirely my own. But I do appreciate the generous responses - thanks citizens!