maybe I'm being too picky, but a 1:1 with the glass removed wouldn't be likely to retain the windscreen trim. If I were doing one like this, i'd remove the trim, then install a ledge along the inside of the body that would represent the actual ledge the rubber would hook over to hold the glass in. perhaps add a remnant of that rubber seal hanging from the body as well. the doors on top of the front fenders are also notorious for rusting away, as well as the corners of the hatch where the window sits. the dash top should be split in at least two places and curled up away from the windscreen (this is common on otherwise well-kept Datsuns!)
And, as was stated elsewhere, anywhere Datsun made a hole in the body, it rusted... even where they didn't.