During development of Rhome, a horror game, I made the mod kit for the Pool Room. The final mod kit was 20 pieces. I used face weighted normals to smooth out the corners of the kit. For the mod kits pieces I used a power of 2 grid system. This means that my core grid units are a power of 2 and my secondary grid units are either an addition or a subtraction of 2 numbers that are a power of 2, with both of these grid units in cm.