My own design of VW caravan_inspired car with removable roof and detailed interior. Seats are suitable for six Lego friends characters.
Wheels are three-part design. First you will put tires on rims, than you will screw it to chassis (use 3mm screw). Last thing is to put chrome covers on rims (to cover head of the screw).
Bodykit is positioned in four points to sit precisely on chassis.
Roof have four mounting points. Use four pieces of 1.75mm filament, glue inside holes in roof. You will get four pins to sit roof on bodykit. Or you can print parts 11-14 and glue it to roof.
Use another piece of filament to make steering axis. Glue it to steering wheel, insert axis trough hole in cocpit and secure it to the floor.