That's not bad at all.
I have a bit of the lumber, but will need all the structural stuff.
I like your design for my place here and it's plenty big enough foe my shoulder-burning firewood needs by the looks of it.
My primary heat source is a large wood pellet stove of which I burn around 120 bags a season and I store them inside.
I was thinking of using tight spaced roof rafters and then putting PAL clear roofing on it to get suns heat on top in summer.
But that may cost way too much.
How big is it? What's the footprint of each cell and how high is the roof?