I don't know what size my ports are. I also don't know whether they are flat or contoured. I'll get answers later when I am over at the club.

As far as putting big hatches between the seats for storage, a guy in Canada did that in both hulls so he and a friend could do a beach-hopping cruise on Lake Ontario. They were able to store a huge amount of stuff. I had a big story about their trip in my magazine several years ago. Sorry, but I can't remember the name of the type of hatch he installed.