To that purpose, my end goal was always to pull whatever environments I modeled into Unreal engine (so nanite and lumen make short work of my detailed models). Which makes me wonder if you had any plans to do the same?

Walking around in ancient cities should not be reserved for assassination missions in action games (regardless of how fun that is). I'd love to just have a 'day in the life' simulation that I could move through, interact with, and study! Feels like a way to make history feel tangible. It would be awesome to immerse myself in a New Mexican pueblo builder society, or with an indigenous Native American tribe on the praries, or in the Japanese imperial Palace circa the Edo era, or in pre-medieval Europe, or, or, or...

Sorry for the predominant 'what else you got' vibe; I really am impressed by the scope and detail of your work! It just tends to send the mind racing with possibility, which I hope you'll take as the compliment I intend it as!