The project, as is, looks wonderful! Since you ask for suggestions, here's a couple off the top of my head; Variety of textures; stones (several sizes) brick, concrete, even metal (the style you're working on would lend itself to that). Sky-bridges to link 2 or more towers together. Walls to do the same at ground level. Couple of levels designed to simulate ruins or battle damage with matching rubble piles. Extended, reinforced balcony to accommodate either "hanging gardens" or "outdoor dining" scenes. "Battlement" style railings Optional glassed in enclosures for balconies. Banners & pennants to hang from railings. Smaller porthole or arrow-slit windows to use for lower levels. Optional exterior-mounted platforms with winches for raising heavy items or construction materials to upper levels. Hope a couple of these strike your fancy - Either way, it's already looking very versatile & well-designed! Cheers!