Interesting concept but, as with all the other comments made, there is also the concern that this kind of design is a rolling deathtrap. You get t-boned in this thing and there is absolutely nothing to absorb the impact. The full brunt of the collision will shoot you out the other door. You get rear-ended, the car coming in behind you will break your spine. You rear end someone else and your sucking fumes as their tailpipe impales you.
You'd have a point if modern cars relied on their "skins" to handle the impact of a crash, but they don't. Bangle even addresses this in the first 30 seconds of the video.