We, my family members and neighbors, used home made heaters or 24 inch air-tight heaters in our cabins.
We all had log cabins. Mostly smaller cabins, 10x12 was a common size.
No insulated 2x4 and plywood structures on any line I've been on. Most were too remote for that. Packing in construction materials was not practical and trees were close and free.
The best heater I have ever seen was one my big brother built from an old seeder grain box. Like this one,
He cut three feet off one end of the original grain box. made an end, with door for the cut end, welded a draft control from an old cook stove on one side just above the bottom and welded one section of cook stove top, with lids to the top and welded flat metal to the bottom to seal the seed outlets. Then he welded on pipe legs and a plate steel chimney collar.
I don't know if it was the shape, the placement of the draft or what, but that heater/cookstove was the best heater I have ever used.
It went with the cabin when I let the line go. Not sure what has happened to it since.