As to the torque-tube chassis, JoHan wasn't always well known for their accuracy. Most, if not all, of their two door hardtop kits and promos used the interior bucket from a convertible. I guess it was easier, and cheaper, to use for both models even if it was wrong for the hardtops. I imagine the same can be said for the chassis. They probably did a '66 Marlin, Classic or Ambassador and just continued to use it for The Machine.