The hatches arrived. I order them from DPI marine and they appear to be just what I wanted.
I ordered four 13x24 hatches. 2 for the entries into the cabin, 1 for the floor hatch behind bulkhead 6 and one for over the water ballast well. I've decided that the water ballast well will not be a water well, it will contain some AGM battery cells for the trolling motor I'm going to install. More about that later. (Note, I may end up getting a larger hatch, depending on the size of the batteries.