I don't see the major problem with it aside from the car that it will flex like a complete whore, but then again, who's to say this car is going to be driven in anger?
Do a proper cover for the rear seats, a drop with some nice wheels and maybe a 89+ (I'm usually love the pre 89 look, but it just doesn't work on that car) and I reckon that would make a nice cruiser for a sunny day.