It will most likely be a "bugger" to restore. Norwegian parts in general can be hard to find and are often "feast or famine". If the price was not outrageous I would buy it, be patient and see what I could find. The stock is a tough call because, in my mind, if one finds an extremely rare uncut rifle stock then cuts it that would be "sin full". The one you are looking at appears as though it could be stretched but metal pieces could be quite hard to find. It is a roll of the dice for sure.