Hmm...I dunno if I'd like that. It's weird enough for me having to sit in the drivers seat (how many times did I nearly try and get in the wrong side last year?!? ) without driving on the proper side as well.
I checked with YearOne and a couple other online Mustang parts stores. Unfortunately, they don't sell any reproduction door skins for '71-'73 models. I'll still look around for any leads.