Awesome Idea Budhah!!!! I like that - ok, the project is on.

Another suggestion after looking at your rear bumper and the closeness of garage door. You should have a pair of sensors on each side of your garage door. Move these up or down to the same height of the bumper, and the door will not close while blocked if you are not far enough into the building. Another suggestion is a red light laser light that cost about $15-$20 at Home depot or Lowes. The laser light will easily be seen from the drivers seat. I have one, even with the 2x4 bumpers on the floor.

One thing I don't suggest for those of you in real tight spaces, is to not use your HOLD button up entry. I find that creeping just a few inches a bit difficult when using the auto break feature.