I guess I should have pointed out earlier
that moving the horizon line would be a few pixels, maybe a half dozen, down.
Though I do have some designs that move the horizon line down by 35 pixels so that I could get a completely different perspective on the walls.
This would be a great time to remind the universe how unhappy I am that all those years ago, CocoaSpud et al decided to go with a rectangular 3D window instead of a square one as FRUA had. (Maybe I should make this a bug, though it would involve changing a lot of art to fix, as well as some code.)