So when you upload the save, what should I actually do? You seem to have done an excellent job of reorganising the fortress and everything, but there's the thing, where do I go from there? =P
Tons of stuff. Bralbaard mentioned obsidian factory. That works. There's more than enough sitting unmined at the moment, but it's still cool. As far as limiting traps is concerned, I think the current amount is pretty good. The two side entrances have 4 traps each all in a single file line and the depot one layer of weak weapon traps. That's enough to stop a squad or two of goblins but not more.
Some other ideas that I had but didn't have time to implement:
smooth/engrave walls: We've got a legendary engraver. Use him. There are lots of public places that could use beautifying. Be ambitious with it too; this guy is FAST.
make tombs: Higar has a tomb, as does the late Christes. I made one for Maggarg too, though she went by the name Ushat back then.

You could make tombs for all the other former leaders, living and dead. Note that there are no loose bodies - everyone is in a coffin now. So you would need to just deconstruct the coffin holding Bralbaard and then build a new one in the location you want and dwarves will automatically carry his bones. Zekrish also started a tomb for himself, but didn't finish. Don't forget yourself, of course. How about a tomb for the liason Kib Halltraded too?
make a giant, multi-z-level basin for the water tower to put water in: These are very useful for making drowning chambers.
make a monument: We have metric shitloads of rock just sitting around. Use them.
Basically, I restructured it and you can beautify it.
Believe it or not, Halltraded is starting to look a little like Nist Akath. We've totally kicked this place's ass.
Oh and
ONE THING YOU SHOULD NOT DO:
Appoint a captain of the guard. Just don't. After the riots a year or two ago many important dwarves have outstanding sentences. If they get killed from beatings, well ... you know what happens.