I'm using 2" of insulation for the top and lids just to make access more convenient. I cut a bunch of pieces out in kind of a puzzle form so I can lay fiberglass over them to secure the top to the already formed lower icebox. I'll be applying white gel coat to the final product and lay the counter top on top of the icebox with about a 1" ledge around the top for the lid to se down on. It looks like a rough plywood behemoth right now and I'm excited to see it through the next step which will look a lot more finished. I'll be putting in custom slides and shelves once I get the refrigeration aspect figured out.