This is very much a project in need of further work. The unmodified resin interior tub does not seem to fit between the body and chassis as-is (the final photo shows the body mocked up over the chassis with the 4 wheels/tires sitting loose in the wheelwells - interior tub is not inside of it). I suspect the original builder may have been considering not using the interior tub, and fitting a custom interior on the chassis plate. The kit is also still missing many parts windshield, all chrome, etc.
All parts included are shown in the photos.