But my point is that you wouldn't invest hundreds of hours in producing joints you'd never produced before. It doesn't prove the pre-Stonehenge landscape was covered with round timber structures comprising uprights and rings of lintols but it does suggest it was....
As for pushing their talents too far, each lintol has three or four joints of two different types and is curved in one plane and tapered in the other and fits into the ring pretty well so it's quite a good effort.
A good effort indeed but working a lintol to produce a curve and two cupped shaped depressions and an upright with a nobbly tenon a different matter to producing a proper m&t joint. I know it's only a name and hardly relevent but things shoud be termed correctly as it can give the wrong impression.
I suppose you could produce a ring of timber posts and lintols in a slightly different way by having the uprights with a section of bough leading off them to place a cross lintol in!