I've been working on a few variants.
Each tile is about 50mm x 50mm x 4mm. In principle is to print one of each tile and then mould/cast them. Simplicity is the goal here, so a standard building could be made with just two different parts (wall component and roof component). Want to go higher? Well, then there's a third part.
Idea is also that the wall variants are interchangeable. The system does allow for it, and aesthetically almost all of them seem to work just fine for that (the one on the far left being a bit of an exception).