1. Shipbuilding skills show in the smart design, aerodynamic, flow, of roof lines, like an upended keel.. Smoke holes. Is this a drying shed, or housing. The angled roof is not only for the big longhouses, but also for smaller structures.
2. There also are round houses, also strong against winds, and with vent-circulation spaces above. For many years, scholars had believed only rectangular, long-house or other angled structures, were built. Archeology now shows the use of these round houses.
5.Smoke wants out. Set up an elongated vent, with its own little roof, along the roofline.
6. Bukkoy standing stone, with what specific significance here? Keep researching. Are there runes here. What are the flat stones around. In England's Stonehenge, the specific bluestones from Wales are found to resonate when struck, they ring! See http://www.theguardian.com/commentisfree/2014/jun/19/in-praise-of-listening-to-stonehenge/ Is there a cache of similar stones in Norway, even if they are now so settled in the ground that they resonate no more. Time to go back.
The expression on its face resembles our favorite at Stonehenge:
Stonehenge: Stone, Outside Main Perimeter, Wiltshire, England
This megalith on Bukkoy seems to guard the entry to a cluster of buildings, but was that part of the original, or convenience now? Memorial seems more likely, than astronomy, but experts are needed. See introduction to issues at http://www.megaliths.net/
8. Slats for fences. Wicker slatting, farm buildings
The log across the entire top of the roof gives extra strength.
There would be less upkeep where cross-slats are each angled down to the support given by the ground itself. Slats may rest on the slat below, as well as deflect the force away from the weaker horizontal.