Visually, these are very nice looking models. But they aren't well designed for 3d printing. For example, the pillars are merely placed next to the walls, rather than properly merging them with the walls. This causes there to be an inner perimeter between the pillar and the wall section ina single model, with a small gap between them. The connection is therefore weaker, more material is used to print them, more time is taken, and a weaker bond forms. These are all small mistakes that I hope they correct.

A perhaps worse problem is the overhangs. They would look just as nice if a very samll amount of attention was paid to reduce the amount of overhangs, especially the 90º overhangs. The stones don't need to stick out so far from the wall to look right, and by angling the edges of stones a little bit less they could easily be printed with minimal (or even no) supports.