Just dropping in to agree that this was an excellent puzzle, even if it required a second printing. If I had a tiny hesitation it was with regard to the tiny 20a, which resisted until everything else was in. Because of the nature of the layout, there's no chance of cross checking the first letter in either the original or the final grid.
It also didn't help that the wiki version of the "another column" has a slight variation , not in our solution. But hey!