Very interesting. I like how you're using the chest freezer. Did you have to caulk and seal all of the seams inside before proceeding?
Are you using a lift or pulley system to move your 20 gallons of cooled wort into the fermenter, and then are those rollers that the plywood with the kettle slides on to get it all the way to the right on the fermenter?
Yes, I used 100% silicone caulk (the same thing you would use for an aquarium). I caulked every seem, waited a few days, and then re-caulked every seem again.
It's been filled for over 6 months now and no leaks.
I will be using a hoist to lift the brew kettle, then I will have to make some type of "bridge" for the rollers to go on and into the fermentation chamber. The rollers will then convey the kettle to the far right. Yes a piece of plywood will be used, the one in the picture is just a piece of scrap to test the idea.