Are there door/hinge kits available if one were to add a storage compartment below the chassis? The original generator on our Transtar was gas, though our G30 chassis was ordered with the 6.2l diesel engine, meaning there is a spare gasoline tank behind the passenger door, below the floor. Since the previous owner took the generator out, we are going to set up a solar array on the roof and use the generator compartment for batteries, meaning I can remove this redundant tank. By doing so, I end up with big empty spot that I would like to make a new storage compartment, accessible from the outside. I can weld up the box itself to the frame/undercarriage and cut back the siding of the house where necessary for the opening (especially since the filler neck for this tank is sticking out of it now), I was just hoping to find a kit with the trim pieces, door, hinges and lockable hardware. This is a relatively small RV and more storage is always appreciated.