@ Aunt_Ester - ClaudiusB was correct, originally the intent was to set up a stout faucet. I can fit 8 five gallon kegs in the freezer and I considered making one mixed gas. I rarely drink stouts though so it has since ended up being my seasonal rotator with a standard tap.
@ sonvolt - I took my time to make sure everything was squared up well and flat. Initially I had purchased some caulk to put between the collar and freezer, but the fit was so snug (along with the 2" overlap) that there does not seem to be any trouble with cold air escaping. As far as the top is concerned, there is already a bit of stripping on it that works just fine. I did have to shim the hinges with a piece of excess lumber to make sure it is centered on the collar.
In Primary - Double IPA
In Secondary - Schwartzbier, Octoberfest, Punkin Ale and Holiday Ale
On Tap - Maibock, Irish Ale, English Pale Ale, IPA, Honey Wheat, Belgian Wit, and Cinnamon Brown