Okan now to get down and dirty and actually build this thing.
-First use your knife to cut out a small square piece from your cooler large enough to run both connectors of the tank heaters. Try to make it as small as possible and neart the base of the cooler. A corner is fine.
- Next remove the plastic from the heaters and paste one in the middle of the base of the cooler (inside) and one in the middle of one of the sides (inside). Run the wires through your hole
-Now we line the interior of the cooler with some foil. Try not make it all bumpy or with air pockets. Best way to do it is to cut into manageable squares and glue them all along the inside of the cooler.
- Now get the lid of the cooler and punch air holes with your pencil. You want plenty of ventilation but to much will keep the hot box....well not so hot. Your gonna want to eyeball this one I usually punch around 16 -20 of them spaced about evenly apart. My suggestion is to cut one third (1/3) of the lid in case it gets to hot in there. Keep the 1/3 of lid you cut out and place it with the rest of the lid and remove if it gets to hot for a few hours.
- We're pretty much done just some simple add-ons. Put the thin towel on the bottom and try fill up 3-5 inches of the cooler with it. This prevents direct heat from coming in contact with your invert. Roll the second towel and use it as a bumper on the side the heat pad is on so that your enclosures don't get to close to the heat. The last step isn't really neccesary but it helps to use it. Stick your thermometer in there and regulate the heat you want it to get to.
- Connect the heat pads and let your box sit over night to warm up. Check your thermometer and make sure it doesnt reach triple digits(it shouldnt). You can now stack some enclosure in there but make sure to keep them towards the center and the side of the cooler without the heat pad. Thats why the "bumper" towel helps
Enjoy. Might make one this weekend, if I do expect some pictures.