Opinions needed

Well, I sorta think you would be crazy to do it!! But that's just me. Personally I would find a nicer, rust free car and build a clone of the "V21" with all the amenities you have described. You would likely be many dollars ahead, with much less time and effort involved in the project. (As if any build isn't already a major undertaking!)

Whatever you decide, good luck with whatever you feel comfortable doing! BTW, I am not against you restoring your Duster, I'm sure you have some emotional atatchment to it, and you may want to proceed because of that!