I am thinking even for Canada this may be excessive. I made this with 3/4" plywood for the inside (leftovers from work). 2/4 ripped in half = 2X2 frame and stuffed with recycled insulation. Two layers each 3/4" thick foil one side. (insulation came from a 1970's camper my dad stripped for the trailer. Then a layer of 1/2" plywood to seal the deal. (My bro ditched at dad's) here's some pics
I choose to use two layers with the shiny side facing in and out.
Blocked out small space for my exhaust (so far build is at zero $$)
K so at this point I have a full 1.5 inches of fiberglass insulation in all panels and the top and bottom. Haven't made the door yet.
Still looking for a burner or an offset charcoal source. As it stands she is 47.5"h front 43"h back 24"wide. Inner measures 19.5"x24"
I'll keep you updated as I progress