Dome Folly Project

I am currently working on a project building a folly in a field next to my parents' summer house in Sweden. The idea is to build a wooden dome, partially buried in the ground, merging the international concept of a folly with a more Scandinavian type of medieval architecture. The end result will be a more humble dome structure than the images above, connecting it with local church and secular architecture. I am hoping to begin building this summer but as it will be rather costly I am prepared with a ten year plan. I will keep updating with more information as I go along. Help will be much appreciated.

Proposed statistics: 12 sides, height 6m, width 12m. Covered in tarred wooden shingles (shakes)

Maquette built to try out structural methods. Using balsa wood it pretty much shows the construction of the arches and the tiled roof.