But would you? Why would you? Things that can be done shouldn't always be. Corvette station wagon anyone? I remember that thing.
Great shop truck, parts chaser. On one of my many delusional/creative days I thought of doing the same thing to an Aerostar.
Kinda looks a little like that VW pickup thing. http://vwtruckforsale.com/wp-content/uploads/2014/05/vw-rabbit-pickup.jpg
Holy cow... As if Mustangs aren't light enough in the ass end. And, aren't the fox body Mustangs unibody? So, I wonder what mods were done to keep it from folding in half?
Everything rear of the rear end pivot point has no impact on the structural integrity of the car. Aside from that, except for flexing stresses, all the driving forces pass through the sheet metal "frame" that runs fore and aft in a unibody just as a real frame does.