Gee, those are nice. My '69 32 just has a hole cut into the coaming board, and the inside of the "box" has a plywood base. It wasn't designed to pitch inboard, and there's no drain, so rainwater would accumulate in there and slosh around for weeks or months until the boat heeled during sailing. Then, just as the sailing started to get interesting, the unfortunate schlameel sitting on that side of the cockpit would get a lapful of cold, green water.
[Or should that be schlamazel? One is supposed to be a person who spills something on somebody, the other is the person who gets the stuff spilled on them. Not sure which is which.]
Eventually the plywood bases delaminated, so after I rebuilt them with epoxy twice I wised up and made inverted L-shaped coaming box covers out of Starboard that rest on the top of the coaming board. Now the boxes are bone-dry but I have to store the covers while underway.
One spring my neighbor had a mallard lay eggs in his Catalina 26's coaming box. (He was kind enough to rearrange his sailing so that the ducklings did hatch.) With the Starboard covers, I never had that problem.