hmm...

Dunno if this was mentioned before but, at the Marauder's guild, isnt there a flag with 2 guns crossed? There are even NPC downstairs practicing with some muzzles... that could pretty much be the Machinist spot... and would be in Limsa...

For the Astrologian... Coerthas has all these observatory towers, it wouldn't be suprising if they alocate the Astrologian Guild in either Whitebrim, Dragonhead or the Boulderdowns region...

Dark Knight is the one that makes me wonder where will they place it... Odin's house?