I have googled a bunch on this, but I keep coming up with coolers for gaming CPUs mostly. I'm thinking it would be pretty easy to make a DIY cooler from rigid housing insulation with or without a plywood shell and/or a waterproof liner on the inside. It also seems one could make a larger and much better insulated unit than what is available at the big box outlets. 3-4" thick walls with a reflectix or similar exterior seems like it ought to outperform the coleman and similar alternatives.
Any burners here who have constructed their own playa cooler?

