Has anyone installed a 6" access port like those sold by CLC? I'm nearing completion of my Night Heron and want to put one in the rear bulkhead so that I don't have to cut into the deck. I am about to install the bulkead and want to cut out for the access port although I don't have it yet. I need to know the rough opening diameter (6"?) and be reassured that I can do this all from the cockpit (don't need access to the back side of the bulkhead) so that I can cut for the port and install bulkhead now, then install port when it arrives? Any thougts would be appreciated.