Just finished sloterizing this vintage MPC kit, starting with a brass Womp Womp and modifying to fit. Rewound 160 motor with #30 wire which worked out to about 10.6 ft. per pole. Driver started as Fujimi mechanic kit until I re-animated him.
Chassis is not my neatest work, but it worked great. Front wheels are independent by soldering a ring of 1/8" ID tubing over an axle, filing it down, then used a threaded end to attach and adjust kinda backwards.