Idea is good..I know I would be interested in this sort of product if done right.
Few quick initial thoughts:
-not that aesthetically pleasing and maybe that's where I'd concentrate your efforts--esp hanging from ceiling--floor standing may be little better but still would prob look little awkward
--maybe some designs would help--or better yet could couple with some parking
aids and even make it pop up or out or something somehow
-what exactly is the material?--although may save dents, looks like probably causes scratches