1. Yeah, you can craft better than those.
4. Didn't you get a quest from the chief of the Foundry Guard to scout some Faceless nearby? Those Faceless are in the cave to the West. Depending on how you go about solving this quest, the cave to the East may become relevant (but not necessarily).
5. Right, some buildings we don't have access to.
6. Did you do Abram's quests in Junkyard? If you do, he is eventually going to tell you to meet again in Core City, where he will point you to Quicksilver again. Note that, in Junkyard, sometimes you have to wait a while before Abram's next quest becomes available. That's one of the best questlines in the game, btw (Abram+Quicksilver), if not the best.
1. Really? Even in trying to keep my armor penalty at 15% or less (so I wouldn't lose my stealth-related bonuses)? Well, I guess it doesn't really matter, I was able to finish the game just fine.
4. Yes, I remember now. That makes sense.
6. I had already taken work with The Protectorate, so I fed him false info. I guess that explains that.