You've scripted this really shit. You've basically just used the Duhen base scripts, when it requires the original Franco MX-5 scripts to actually run. I managed to fix it, however. But you didn't even include that the DS LGT Headcovers are required for it to be complete in the catalog.
If you're thinking of dling this mod, don't. It's the same as the old one, just without the pickup option and with some stupid stickers on the windows.
But if you really want it, here's a fix.