This is part of a modular building set which is part of my Necromunda collection. The original was made for a mix of 3mm and 4mm materials, and have been converted to be all 3mm. Pictures are of the original.
The Nordgrim tower set consists of a number of corner pieces and floor tiles. For each level you'll need four corner pieces in some combination, along with one floor tile. There is no limit to how tall you can make the tower. I prefer keeping all levels the same width, but you can make the tower narrower as you go up, if you wish. You can glue the pieces together if you want to, but I prefer having them separate so that they can be assembled differently for each game.
This is a floor tile made to fit the 12x12 cm towers. It has a ledge around two of the sides, thus the actual size of the floor tile is larger than the other tiles for the 12x12. When making a tower of this width, you'll want mostly the 4x4 and 8x4 corners, and only the occasional 8x8 corner.
Dimensions are roughly 165x165mm (XY)
Black = cut
Red = engrave