Mike
I made my points on these holes in the "Architectural Evolution of Royal Dornoch" piece I wrote which is in the "Course by Country" section of this website. As I said there, my thoughts are speculative and informed, but not conclusive. That being said, here are my speculations, based on the geography:
2--a "volcano" hole on the higher "raised beach" part of the course where such land forms do not really exist. There is evidence that the hole was manufactured by Sutherland (in opposition to Ross, who wanted to build a punchbowl green to the right). The tee was probably more leveled than built.
6--a green which was pretty obviously cut into the hill separating the higher and lower raised beaches in 1946 by Duncan, McCulloch and Grant. It is a beautiful hole--perhaps the most photographed one at Dornoch, but it is not natural. The tees are also cut out from the hillside.
10--a green which was pushed up from a flat and very narrow piece of pure linksland. Again, not a landform which exists naturally on the site. The tee was again probably leveled rather than built.
Sorry to you (and Tom MacW) for using the hyperbolic "completely." However, with a par 3, if the green is manufactured, "completely" pretty much says it all about the hole, IMHO.
Hope this helps.