Wall/Grid pattern

OpenSCAD module library for a gaming tile system on a square grid. I mostly play Pathfinder and D&D, so I need a 1" grid. Since everyone on Thingiverse seems to be metric, and 1" works out to 25.4mm, the pattern set is intended to produce 26mm grid spaces. Walls themselves are 4mm thick, and set between grid spaces, not within the grid square. This is really the only way to have real physical walls for something like D&D, unless you want walls to consume entire squares.

Pattern set consists of "walls" and "posts". Posts are designed to sit at the ends of walls and hold them together, giving them some rigidity. I couldn't see how to have walls connect directly with each other and still keep the number of unique parts very low.

The wall module has recesses intended to receive the post module, and a protrusion on the bottom intended to be receives by a plate module. The pocket on the top is not intended to receive another wall module, but instead a thin protrusion extending from the