I had a listing of a 40' Monk that I sold back in 2007. It did not have a keel configuration like this. From looking at it , the design looks like it would be great to lessen roll when on the hook. I have sold boats with "bilge keels" and this would accomplish the same thing.
here is a picture of the Miss Heather also built by Hiptimco.
Tucker Fallon CPYB