Ya ive considered this, actually i would just line it with styrofoam sheeting (the kind you stick to the outside of your house for insulation) and then line that with a thick gage Poly. This is alot of work though. and if it doesnt work out it would be a mess to take apart. A cooler is just really simple and easy and will offer the best insulation possible. plus, at the end of the day. all the wood, styrofoam and poly and glue will equal the cost of picking up a cooler. I havent taken custom framing one off the table but if i can pick up a cooler of the right size at the right price, I would prefer to go that route
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