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 o