What rank was this guy in his engineering class. Smart money would not use this as a job promo and frankly if the guy worked for me he would get the axe!
1. The AC unit is secured by a strap system that would come off in a heartbeat in a wreck. One bump from behind and the guy behind you would have that thing coming through the windshield. If he hits something it becomes a ballistic projectile for anything ahead of him.
2. You have just f'ed up the CG of the car.
3. You have added parasitic drag that will effect your fuel mileage and kill the cost/bene ratio over the three years you have been running this wreck.
4. Fire hazard .....
5. No more tunes on most radios.
Smart money would have used a trunk mount to keep it out of the air stream and flex duct to pipe it in. It would also make the noise and vibration (right over your head), more remote; that has to be annoying. Lead foil that he could have swiped from the medical or electronics lab may shield the radio and all he had to do was use heavier gauge wire for the extra distance. A couple of heavy steel "L brackets" and approprate bolts would have kept it snug and secure.