I made this for my Brickheadz collection. The tolerances are very tight, they need to be to keep the shelf sturdy once you start adding more than a few of them. They can be a little difficult to fit together if you are not putting them straight.
Brim is not reccomended. I will take significant work to clean it up enough for them to fit together.
Use a couple of the model with the mounting holes if you plan to hang this on the wall. Really depends on what you are putting on them, and how many you are tesselating as to how many mounting holes to use. You can