Interesting engineering project - out side the box. For those who are bored with the Lambo style doors, and have even more money to spend.
File under '53 Kaiser Darrin (doors slide straight forward, into front fender).
Or Isetta (whole front of car is a door - the only door).
Or bubble top Messerschmidt(sp?) (whole top of car hinges sideways).
Or Sterling kit car - saw one on road this week - (whole top of car raises up).
And now I'm envisioning a roll-up garage type door on a Hummer?