I was going to mention the insulation but when you showed it covered up with ply, I thought that might be ok. Glad you checked. Is that board a foil faced isocyanurate? I use Type IV polystyrene in mine but it's on the outside of the wood chamber. You could probably do the same if your unit is under cover.
EDIT: I see the first pic shows that it is iso insulation.
EDIT2: I should mention that I don't use chips, I use the sawdust mix, the kind they use in industrial smokers. 50 bags are dirt cheap. I think it's mostly Alder. I sometime add larger pieces of hardwood to help get the next batch of sawdust going, kind of like a punk.
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