> An awful lot of the numbers around the edge are listed more than once, and
> 4 or 5 of those around each glyph ( except G7 ) have duplicates. Matching
> them would generate ways of arranging them in space, although the most
> natural 2D arrangement (6 around one central glyph) doesn't fit the 45
> degree angles very well.

Yeah, I was playing with this idea back before any centre glyphs were solved. I saw the dials and numbers arranging themselves into a sort of Wumpus map, if you know what I mean by that. I had given up momentarily while the centres were dropping one by one, but now I think this idea could usefully be combined with the one Tiny Toad and Tychus just posted on (where the legs of the capital letters in ARRIVAL are used as vectors to indicate numbers on the dials). Perhaps those numbers are the ones that are meant to match up and link the glyphs together in 2D space (simpler than a Wumpus map, because there are only two links from each glyph).

Chopping up the image in a graphic editor and moving the glyphs around individually helps with visualising this.