Im working on rebuilding my ice box aboard my 36' Pearson. The current icebox is a massive cave with almost no insulation. Im planning to rebuild it into a 3.5cuft box with at least 5'' of insulation all around. The cold plate system ive chosen is going to be aabout $850 from West Marine and is made for 6.5cuft with 3'' of insulation. Im not sure if its going to be a really good icebox or a freezer.