This one only had 2 rivets securing body halves.
Chop off axle tubes, make gearmotor holes, glue motors under the wings, backfill some glue from inside chassis. I could have narrowed the rear track closer to stock, but thought it'd play in well with the endless debate about Tricycle vs Wide tractor stability. They were scared and put wideners on it.
Chop down the front axle steering tab, glue a vertical tube to steering, make an ugly linkage.