Even with that flat front, the back is more important.
Do it. Except have it go all the way to the back of the trunk line. When you open the trunk, it could slide under the aero back if you hinge it at the roofline. You could hold it down with two dollars worth of bungees on the underside. If you use acrylic, it could be almost as clean as the original aerocoupe was. Just a thought, my (car's) backside is even more square than your (car's) backside.
