Love the concept and the composition - it's great
I think thought that some of the lines aren't quite horizontal and vertical. I think a slight clockwise rotation to get the top line horizontal would help (unless it is horizontal and I just need to put my glasses on) Not sure whether there might be some lens distortion as well with not all the lines appearing parallel?
This made me laugh Mark, thank you!
I never look at the horizontals to make photos plumb, only the verticals, but I'm sure you know that already.
Thanks for posting.