Yeah, TFNG here with questions but I'll try and lay this out as best I can to avoid a bunch of confusion. I've ended up way North of where I lived for many years and winter temps aren't playing nice with my ECB smoker so I go and build this to put my ECB in during the winter and may just use it in the summer to conserve on energy/ combustable's usage. I tried rotating the picture on my hosts site. :dunno Anyway, it's multiple layers of both aluminum foil and 100% wool blanket material between 3/8 inch plywood with the interior lined in aluminum. The door's gasket is 100% wool twisted and stapled into a shallow dado cut. It measures 18" X 18" X 33" interior and has a total of three inches square air intake and exhaust with dampers, this isn't accounting for the hole in the bottom which can be sealed. It's been tested in 20 degrees F with Original Kingsford brickettes and has proven to likely never need lump coal of any sort no matter what the temps may be but I'm working on getting lazy or would like the option anyway. My ECB was modified with ventilated coal tray as well as a cheap B&D single element electric cooker which I feel is my problem with reaching preferred temps during the winter cold by way of electricity. Looks like this now, it's hard to see but the control for the element is on the exterior of the ECB. This set up with an aluminum frying pan wood tray only got to 165 F in 30 degree F temps and than the element bought the farm. Being I would really like the option of going controlled electrical temp, what would be your suggestion for an electrical burner for the bottom of my ECB? I hope to keep this low budget! Thanks for any information you may be able to help with!