Cool concept, but why exactly was the custom texture needed? Practically everything on it is taken from an in-game one. Why not utilize them instead? You'd be saving filespace.
A couple more things I would change:
-I can't tell if this is Magos acting up but geoset animations for the first tier seem broken (the entire structure displays at the start). Hopefully this isn't reproduced in-game.
-The base of the structure goes deep - but those little braziers from the Tauren Totem do not have a longer base, which means that they will float when the structure is on sloped terrain (most of the time in WC3):
View attachment 381080
-Since this seems to be a Town Hall type structure I would add more layers outside of the main building as well as it keeps improving in tiers. Totems around the structure, a fence, banners, anything that would change the silhouette in a more significant way.
-I would maybe consider adding bits of Tauren totems and other similar decorations found in the Barrens doodad set, particularly to the later tiers.