I am a big fan of modularity, sometimes to a fault, so when I was thinking about making D&D boards the choice was obvious. Unfortunately, These were not particularly well thought out. If you look at the rounded corner pieces below, you will see that they were designed as if the curve was even throughout the wall, which is just silly.
Unfortunately, the hole placement on the interior of the tiles was chosen based on a bend with a 25mm radius, so changing the bend removes the justification for the hole placement that all the doodads are based on. I had already lost interest in developing this by the time I realized that, and the addition of going back to change the hole placement didn’t help any. As it is, it is semi-functional, so I attached the files if anyone wanted to mess with them. Just keep in mind that there are a lot of errors.