Hey beach, I have a '76 32 Oday as well and I believe our ice boxs are in the same place. The stock insulation on mine was a shabby 2" lightly taped the the sides, with much air flow around it. I removed the stock box, installed 6 1" layers on the hull
, sides, and bottom, doubled the size, and planned to install a engine driven cold plate. Since then I have discovered solar
and wont do engine driven, opting for solar. I guess my point is start with the box if you wanna be off the grid, but if you stay plugged in the stock box might do.