Well, GAF may be right.
One thing that makes the study of these ships so interesting is that, despite the amount of research that's been done on them, some big questions have never been answered. Just what are those T-shaped things for? Why are there three of them - including one almost bumping against the mast? There's plenty of evidence that the Norse set up tents on board their ships - but just how did those tents work? Is that deteriorated mass of wool cloth in the Gokstad burial site a sail, or a tent?
Just how did the bietass work? It's widely assumed that their feet sat in those two blocks with round, shallow depressions in them. If so, how come their are two depressions in each block? I remember reading, quite a long time ago, an article whose author suggested that those blocks were in fact sockets for an a-frame mechanism that was used for raising and lowering the mast.
One possibility: the three T-shaped posts were intended primarily as supports for the yard when it was lowered. Maybe the yard served as a ridge pole for the tent.
And where on earth were the oars stowed? I haven't checked out the geometry, but I wonder if it would be physically possible to slide them under the deck boards? (Those boards are easily removed; they sit loosely in rabbets formed in the deck beams.) I don't see how all of them could have been piled up on the T-shaped thingies.
The answer to all these questions is the same: we just don't know.
The photos on my thread show my way around the problem: I glued the oars in the oar ports. (That wasn't easy - and no, I wasn't able to get them all lined up absolutely symetrically.) The configuration of my model obviously isn't realistic. (Impaled on a pair of brass posts, oars out, sail up, no chests for the oarsmen to sit on - and no people.) But viewers don't seem to be bothered by that. (After all, the great British Navy Board models aren't realistic either: they don't have planking on their bottoms.)
Building a model of a Viking ship automatically forces the builder to make some pretty big choices. Who's to say whether one approach is better than another? This is a subject that, no matter how much you read up on it, inevitably leaves lots of room for personal judgment and taste.
Youth, talent, hard work, and enthusiasm are no match for old age and treachery.