Interlocking Brick Window

This is a casement style window for a Lego compatible brick wall. It features a slot in the side to insert "glass" such as clear acrylic or paper scenes or perhaps something to diffuse light.

I generated the blank brick using thing:615256 and then added window features and the slot using TinkerCAD.

The example in the photo is printed with Simplify 3D using supports inside the window opening and slot. Those required a little bit of cutting with a razor knife to clear out without damaging