After reviewing the model with my dad, who's been on multiple occasions, I went ahead and did some tweaks. It didn't make sense that the mountain would crest above the aqueduct, so I trimmed it a bit. Then, looking at every arial shot, I couldn't avoid the fact that the hillside is completely forested. So I built some trees, had to get a little creative to make them small enough/fit the scale. Used a similar idea to what's done on the Detective's Office street tree, but smaller. Put in some green slopes here and there to dot the rocks with greenery. Then added a display stand and tiles, to label it like an Architecture set. New projected price point ~$602 according to BrickOwl's calculator. It requires 12 ultra rare parts, the "Tan Slope 1x2 Triple" (the cap pieces to the angled flanges on the bottom tier struts). There is only 1 seller in the world with stock, and he's charging $5.35 per piece. I guess there are more expensive parts out there, but rarely do you need 12 (or in the case that my dad wants a copy, 24) of them. Ugh.
Quite happy with how it's turned out though! It would be super cool if Lego explored an "Ancient Architecture" sub theme at some point in the future. At this scale I suppose this is sort of a cross between Architecture and Creator Landmark, but it sure would be cool if they did it at any scale!
Edit: ^^ Click in and go Full size, it's a huge detailed render, preview on the thread doesn't do justice to BlueRender's abilities!