watertight box -- backwards building a travel trailer, volume "minus one"

this is a terrible video and i know that. it's part of a total travel trailer rebuild and i'm posting it early and unedited to show a group a couple of the principles incorporated in our "backwards rebuild" process for this little trailer. two points to be made: first, notice the brown "X" marks inside. these are captive nuts mounted in the frame that will allow secure fastening from the inside versus the normal construction method, which is to fasten the frame to the interior from the outside. second, notice the significant overhang of the roof skin on either side of the trailer. that was created deliberately by essentially tilting the walls toward the middle to make the front/back profile of the trailer a trapezoid versus a square. that makes the box significantly more stable side-to-side and may never be something that is needed or tested, but we did it this way to increase the structural stability of the "hard tent" that is created by only a frame and skin . . . in like manner to creating integrity by skinning an airplane wing.