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 special rose window piece that will only fit a 12cm wide tower. It is probably the one piece from my entire Necromunda collection that I'm most happy with. Unlike the other wall pieces, which are corners, this is two linked corners. The assembly guide doesn't exactly cover this piece, but if you've assembled some of the other pieces already and you think of it as building two corners at the same time, you should hopefully be fine.
Dimensions are roughly 130x45x95mm (XYZ)
Black = cut
Red = engrave