That's very interesting, Hob. It's nice to read about the wider view, trying to get into the mindset of the people who built the circles - where they got the stone from, and why they might have got it from there (and then maybe you can think about what went on when they'd built the things).
I kind of like to think about the different people that might have been involved. You'd have to have had your Brunel types that actually got the project (and the stones) moving, but then maybe they had their artistic consultants (figure 6) to choose particularly striking stones, scientists to advise on the layout, and whathaveyou. And I thought the bit about "The presence of monoliths within each circle from other stone sources ..may relate to the drawing together of different places, people and identities" was interesting too. Because it's tempting to think that circles were very 'local' when they're remote but actually you'd probably have familial and trading links all over the place, which you might want to represent. Hmm all very interesting stuff thankyou.

ps I like your most recent pointy stone photos - very sculptural as you say.