Thanks for the heads up on having a tight seal. I siliconed the collar to the lid and am planning on getting a can of spray foam to go around the inside. I also have weather stripping around the bottom edge of collar where it sits on the freezer.
I was thinking of having 2 regular faucets and a stout faucet.
I was having issues with the 1x8 lining up around the edges and gave up last night. This morning I ran to the hardware store and picked up some more fasteners. I secured the trim a little differently and it lines up just fine now. I also added a piece of OSB to the back of the collar to space the lid and collar forward just a little more. I started off trying to do 45 degree cuts with a skill saw. My miter saw won't cut 1x8's. They turned out ok but not great so I cut the angles off. I have some more trim board and will redo the front later today.