My original transformers plan didn’t work out but I was able to do something similar.
My main goal was to add things (weapons, transforming, etc) to the set while still maintaining the near complete look of the set. Still has the pull back motor too. Also hinged the roof so a minifigure can get in the drivers spot.
Standard vehicle
Bumper and roof guns
Fold out doors with more guns
Hood turret
Removable bumper for triple blasters
With engine removed. Unfortunate the hood turret has to be removed to get the engine.
Unnamed Engine robot / drone