Thanks! I tried to focus mostly on the DLCs, with a few new interiors in the Mojave. Nothing in Honest Hearts, one building in Old World Blues, several in Lonesome Road, lots in Dead Money. I recently started New Vegas again, and this discussion just reminded me of one new interior I forgot to explore in Lonesome Road. Now I have to go back!
https://www.nexusmods.com/newvegas/mods/59757