I do hope some 19th century joker didn't sketch it in though!
Doubt it, the manuscript seems to have a pretty good provenance.
I'm not convinced much can be deduced from the number of trilithons shown standing. They're shown in a circle so it could be just a slightly muddled symbolic representation of the whole circle.
M'be, but the artist has gone out of the way to show the M&T joints - looks like he thought the tenons went straight through, which means he was aware of them but didn't actually shinny up there to check 'em out. Little bits of detail are interesting, like the chamfered corner of (especially) the right-hand trilithon in the foreground.
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