Here is the ruleset I've cobbled together to run the Anomalous Subsurface Environment, Patrick Wetmore's gonzo megadungeon:
The setting and the Scientist and Robot classes are, of course, from the ASE modules.
A powerful impetus behind this is to play a game where I can use The Dungeon Dozen as a straight resource.
This is intended as the Players' document, and doesn't contain things like advancement. And it only goes up to about level 6, because I'm intending this for PbP and holy geez, we'll all be long dead before anyone gets to level 6 via PbP.