With the exterior painted it was time to tackle some engineering. Technical building isn't really my strong suit, but I can be as handy as I need to be most of the time. First I tackled the shelves using some pegboard I had around. I cut them out with a sabre saw and decided they were too thin, so I cut out two more in the same shapes and glued them together. It would have been easier, perhaps, to go get some nicer wood of the correct thickness, but I just wanted to keep moving forward. Also it's good to use up stuff and not spend money!
Since the shelves and the dice tower kind of came together at the same time, I'm going to show the piece I used for the top half of the dice tower first. It's obviously some kind of piece for joining misaligned PVC pipes. I figured the corrugated sides and the bends I planned to put into it would work for tumbling the dice, no "baffles" necessary inside. I painted the piece gray so that it looked more in-keeping with the build. The following pictures show it in place, with the two shelves (unpainted and then painted). Note the cut-outs to secure the top and bottom of the dice tower/slide.