Since I'm switch from canyon fishing to giants now, I need to make a coffin box since my vats, while they are big, aren't long enough for a giant. Tuna bags aren't my thing since they don't really hold ice too long and are good for one fish. With this box I'll be able to limit out and keep all of them on ice (if the Gods are smiling on me). 8'x4'x4', 1/2" AC on the outside, 2" foam board, 1/4" AC inside, then drilling holes throughout the inside plywood and filling any gaps left with expanding foam. Then it's all getting glassed and gel coated. The lid will be 2 pieces so it's easier to remove and also have 2" foam board insulation, along with 3/4" plywood and 1/4" plywood covering the foam. Here it is so far. 2x4s on the top are the makings of the lid and just tacked up there.