No it was more of a proof of concept. He scaled the placement of meshes as well as the terrain, which as you can see with the gaps between meshes, it doesn't really work unless you also scale up every mesh.
This actually wouldn't be too complicated, all you would have to do is some creative work placing the meshes to fit with the large scale, and maybe expand the cities to make them of more realistic scale (which BTW I think the scale looks perfect on those 2X2 screens, Balmora especially). This wouldn't even be as ambitious as TR because you don't need quests, meshes, textures or any of that stuff. Just modders who know how to work the CS and just go cell to cell, or use a claim system for cities and such.
I'm guessing the only reason people haven't gone through with it though is because it would be incompatible with just about every mod out there that edits exterior cells.