Yeah I second that this is an exceptional job. Can't wait to see it running in the dirt! It looks like motors have plenty of torque. Speed looks about right with 60lbs weight. An ESC will help control model speed as well. I think the model will need a little ballast (weight) for the proper stance and track grip. 2X batteries at about 10lbs (total) should be perfect.
PS I would not worry about the squeak. Tanks were very squeaky (and still are) - it will make the sound authentic!
I hope Ryan is planning on upgrading turret rotation, elevation, sound etc. This will be a great low-med budget full option RC model if so.
Best regards,
Bob