I always found Stonehell much to cramped for my tastes. Ideally I would actually disperse it more. I am not of the school where a megadungeon needs to be fully inhabited, but rather of the school of thought that a megadungeon is an underground environment with scattered enclaves of various groups, usually separated by dull empty space in which they can skirmish or sneak through.
Apologies if anyone manages to take away any actual information about the layout of the original Stonehell from this version, but if they do they are much more skilled than I.
Edited to add: And here is the final result I will be using.