Maybe I'm just cheap but I have always used a plain old 120 qt Igloo from Target, Wal-Mart, etc. It sits only about 3" tall if the hinges are right at frame height. It faces the rowing bay and opens all the way. It won't open quite as much if my dry box is open too, which face the front in the front bay. It hangs from the frame, about an inch above the floor, on 3" seat belt webbing with adjustable glide fittings. Loop straps hold it in place over the top when you need good security. It never came out of the boat or opened up during my flip on Lava!
If you use good ice and "manage" it properly, the Igloo will keep things cold for a 5-7 day trip.