Well I have all ways wanted to make one, but never really need to till now. Playing with my son (game of SBH) he kept throwing the dice all over the place. So I pulled out a TEMPLATE I got some years back. It called for thick card to be used, but I have opted for foam core. Now it is not finished yet but it is a work in progress. Also note that I used stained glass windows on this tower. I know it is hard to see but they are there. The tray at the bottom I whipped up as there was not one in the template.
Here is the stainglass image I use. Just print on overhead sheets, cut and use.