Take care when cutting the wallboard. I tried a Dremel first but ended up using tin snips. It is brittle so I avoided saws. I only needed 3 sheets as I leave the back open for access. After I cut the front section out I drilled holes in the wall corresponding to the frame supports and pounded grommets in. This was to accommodate the cable ties I used to attach the sides to the frame Next I covered the wallboard with photo-realistic brick wall "scene-setter" backdrop. The wallboard is white so I lined the interior with black weed-cloth. Regular black plastic was too reflective. I did not want to paint the walls figuring I'd be repainting every time I bent the walls.
Assembly is easy, just insert the uprights; add the siding using the ever-present cable ties and the pre-drilled grommet holes; toss on the roof; then hook up the FCG & lights. I set up a black-light for the interior and ground floods for the exterior. I also put a fogger on a timer inside the crypt for added ambiance. The crypt turned out better than I hoped (mechanically challenged here). Several ToTers just stood in front of it watching it run.