I like the concept! There's no reason it can't be used on the right wing, away from the fuel vent. I'd prefer the entrance facing the fuselage, as shown in a couple of pictures (makes loading/unloading through the passenger side easier, where belongings/supplies are most likely to reside anyway). This also protects the entrance from wind, keeps the tent from "inflating", and presents a more aerodynamic profile to winds from the unprotected directions (sides not facing the fuselage). There is no reason the tent can't simply be disconnected from the wing and left on the ground during any flights. Simply Tuck the entrance under the apex and back "wall", which is then drawn over the tent and it's contents and staked, providing additional protection in your absence.
Improvements? It's a lightweight tent! If it's weatherproof and has a floor that will stay dry, that's all I really need!
During Clinton '06 I used a self supporting tent (A little too large, really) that I set up under the wing. It used collapsable fiberglass rods for support, one of which suffered "green stick" fracture during one of the storms. It was easily repaired with tape. I'm sure my tent is three times as heavy as the one being discussed, and isn't nearly as compact when stored.
