Anyone know if the cement wall backer board for bathrooms ( aka as wonderboard ) would be good to line the inside of my gosm? Is it heat resistant, would it leach chemicals when heated? I was thiking 3/8 thick could fit in the channel around the inside front door and panels could be cut for the back and sides to wedge between the rack guides. Even a piece for the bottom could be cut to fit with a large opening for the burner. Think this would increase the heat holding effiency and help prevent butts and such from the dreadded freeze in the pull temp?