1. Take a Stainless Steel stock pot and lid that will fit in your box. Better to find the box to fit the pot, or better yet, make one out of the thickest foam board you can find leaving a couple inches all around. I like the 2", and double it for the top and bottom. The top can either fit inside or over top as per your liking. Make sure the lid is at least 2" thick, but I like it thicker for a super insulated cooker.
2.Grease up the entire outside of the pot with Crisco or your favorite grease.
Use spray foam in the bottom of the box so that the bottom is 2-4" thick, then slide your stock pot in the box with the handles in the corners for easier grabbing.
Spray the foam insulation all around the pot to fill up the box making sure you DON'T cover the handles. About half full, shimmy the pot back and forth to help foam settle. Can fill to about an inch or so below the rim of the stock pot. Let sit for a few days in a warm place to dry and cure. When you're sure the foam is dry, the pot should slide right out.
3. The outside can be painted or covered with your favorite wall paper for easy washing.
Sounds like a very insulated "hay box" (thermal) cooker you have there.
Thanks for sharing your knowledge.
If you have any photos of your box we would love to see them if you wouldn't mind sharing.
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