Thank you very much ! Glad that you like my build.
The exposed beams on the roof are to keep the roof thatch in place and are seen on older style houses here in Sweden, so I reccon it would have been used in the Viking era to.
here are some fotos of different Swedish Houses using the same style of beams.
The first two pictures are from the Swedish island Gotland


The two picture below are from the Viking Museum village at Birka. Birka was the place of the biggest Viking town in Sweden

