Manufacturing a car is quite different from manufacturing sewing machines. That's probably why you won't find a useful generic template.
Perhaps an industry association (I know that's a stretch) may have something.
I, personally, wouldn't look for a project template but, rather, for a checklist of "things to do". A generic checklist should give you the rough idea of the deliverables and, once you've identified the deliverables, the rest of the schedule development will just fall into place. From there, it's the old iteration game: does this make sense? what's been left out that we need? what's been put in that we don't need? Lather. Rinse. Repeat.