It's a beauty, but I don't like the higher portion still having the rough side on the inside.
Bits of this and that will collect in those little ledges, and may catch an ember.
With smooth sides you'd be OK, - consider how similar it is to a teepee. Like a teepee, it needs some cooler air to vent in near the bottom, but you don't want or need air to vent in near the top - that just short-circuits the draft you are trying to create for the smoke to exhaust well.
I guess Scandinavian architects don't chat with Plains Indian tribesmen, on the finer points of teepee design.
