Speaking of shenanigans: to recommend any roof system whatever, you would have to know the max snow and wind loads in their area of Denmark. And how many dance parties do the occupants plan to throw on the roof? Yearly temperature range? Desired U-value? Danish building codes?
Indigenous architecture (yurts/gers fall into that category) is not the same as residential construction as it is now practiced in the US. One can use rafters much stronger than 2x12, for example. Or tap into the Modern Technology of engineered lumber. Look closely at the "redundant engineering" of both types of yurt, and you may be surprised to find how much the rafter poles, as a group, contribute to resisting compressive and lateral forces on the structure. I remember from Groovy's website that even the wool
wrapping the yurts acted as further "muscle" to support the structure, in the opinion of examining engineers from their area.
Hierony's prodile shows a cool yurt that was made in Hungary by Adorjan Yurts. So there's
at least one maker in Europe.
If a person is somewhat handy, a self-build may be reasonable. Or a partial one: make the rafters or the wall yourself, in close contact with the manufacturer, and save the $ spent shipping all those wooden pieces overseas.
was willing to sell me just a roof, for example.
Yes, it's even possible to self-build the "modern" vinyl yurt. I had a book on the subject written by a company which has since closed. Or you might improve a traditional-style yurt with more "modern" infrastructure/insulation.
All kinds of good solutions. My opinion is that a ger or yurt is in general a nicer place to live than a shed or very tiny flat (admittedly I haven't tried the shed).