Sealegs,
You may want to also consider getting the control panel up out of the bottom of the boat.
I have a 1981 27, and i could not figure out why they designed the interior with a breaker panel 3 inches of the sole of the boat. Especially with a bilge that is only 2.5 inches deep. I had the same problem with my panel going under water.
I brought Blue Sea breakers and took the opportunity to separate the AC form the DC. I also put it 3-4 feet up in the boat. I have seen other people on this site doing the same thing to fix what I consider to be a major oversight and design flaw.
If I were you I would move the box if you had not already planned to do so.