Pretty to look at, that is for sure. Any irregularities are well hidden in the naturalistic form. However, I'm troubled by the last cell of 11/19 at 06.15 (in clock terms).
11clockwise needs it to be an S, but the clueing of 19anti invokes a plural, which seems, imo, to require an R.
Think it has to be the S but I can't justify how. (or where I have gone wrong).