I can truly appreciate this build as I have lived all my life with just wood heat at home (nothing like the radiant heat from a wood stove &#128512. My shop has a plate sleel stove in it that could benifit from some rendition of this heat recovery unit. But first it needs insulation! Thanks for showing.

As a side note the panels you used to hold the heat in during the paint cureing jogged my thoughts to the ones that my boss has stacked out back of his shop yard from building his business building. May have to see if he will turn them loose. They would work great for the walls of the car port garage I want to build out of a greenhouse frame I salvaged last spring. The thing was very big for a back yard, back road green house, something like 32x80! All but a few of the rafters failed where the collar tie met the square tube rafters. No heat, too much snow, and not cutting the plastic as a last resort = total collapse. And to light of a frame for that wide a house in this area. What remains of the rafters will make about a 16 foot wide structure. Not enough time in the day.
Eric