Are you trying to restore to original, or with newer, safer and better parts?
Not really, safe to drive, decent cosmetics and hopefully rust free.
I’ve made various small modifications since some original aspects never appealed to me.
FWIW I did a little searching for donor tubs and found a prospect but it’s an M38 tub so no tailgate. I’ll review the photos closer.
If all the boxes check and truck shipping could be done, I would go for it. A tailgate isn’t the most important thing.