Links updated. anyway I'll try to make an update soon, to fix the random fizzling bug.
The DSA are very loosely documented in words. Most of them are in english. Absolutely no quest is documented, though I have some documents about the technical stuff that was necessary to create the dungeon.
Gambit is hosting maps at
http://dmweb.free.fr/Stuff/conflux3maps/
As for walkthroughs, quests guides or others, it's up to the players to manage them.
I think ChristopheF could host a mirror in the Encyclopedia and Beowuuf another one in his DMjump site. Maybe you too. I never bothered because I'm still fixing bugs and never reached a finished state for CIII. People are still complaining about
design bugs
Anyway, if someone wants to host a mirror, I'll gladly accept it.