Self-made suitcase on platform

Moin Moin! I would like to use the whip of a small truck (APE TM from Piaggio) to construct a weatherproof case structure and look now KNOW-HOW. The box, which is intended to serve as a substructure for the construction, has the dimensions of approx. 2×1,5m. The box should reach a height of approx. 1.60 – 1.70m (from the platform). I did not decide for an original box from Piaggio, since I need on both longitudinal sides (2m), as large as possible entrances to the interior (via flaps or also roller doors, similar to those of fire engines). The case should, according to my idea, be based on a steel pipe construction, which is then “covered” (no wood, but in aluminum mounted composite plates). If it should be the roller blind variant, come among other things still large awnings, then of course (2 x 2 m is only relatively large *G*) Despite the apparent simplicity of the construction, it is already clear to me that there will be a whole lot of things to be done. In particular the case has to be difficult weather.