Wouldn't a laser beam saw the car in half?
If I were in your position, I would just use something like a large foam wall. Something you would find in a camping store - the old school foam stuff (non-asbestos
). It would probably be 2-3 inches thick (i.e. compressible). A gradual approach would easily show a touch of movement at the top. It could be like 4-5 feet tall from the ground and, again, the top would show subtle movement once it's barely touched. I've done something similar to this, temporarily in the past, and it worked pretty good.
Another option would be something like this:
http://www.amazon.com/MAXSA-Parking-...sim_dbs_auto_6
However, if you're talking only an inch, you'd have to get your measurements just right.