Okay, so what you do is take AW as written. Then add all the LE, Custom and Other playbooks into the mix.
Then add all the custom moves for AW that you can find.
Then look at all the threads in Hacks and all the Hacks subforums. Add all of that content. Even if it doesn't make sense, is unfinished, or otherwise incoherent. Strata? No problem! New stats? Not anymore! Basic moves? No such thing!
Like, just copy-paste every hack thread with custom moves in it into a bit file and then print it out. Include all those stay PDFs of various hacks floating around. Dungeon World, Bulwark, Dead Weight, Monsterhearts, Planet Algol, Goblin World, whatever. Tell the players that everything in this document is legit.
Whenever there are gaping wounds in the mechanics (which should be 99%-100% of the time) house-rule a custom move on the fly.
Whenever a Player says: "I like this playbook but I wish that..." or "Can I be or do or have..." come up with a custom advance / piece of gear / character crap / custom move / name / look / &c. on the spot. Don't worry if it fits either mechanically or thematically. Don't worry if the move you come up with is any good or is consistent. Whatever you can think of in the space of one-to-three minutes is good, so long as it roughly adheres to "Advanced Fuckery." Roughly. Do not worry about petty things like 'tone,' 'balance' or 'coherency.' In between sessions, come up with new subsystems, power creep and read lots of National Geographic and comics.
Be sure to make lists and maps like crazy. Even crazier than in AW. I remember the lists and maps in Rifts and they would make Vx blush.
And voila!
THE APOCALYPTIC MEGAVERSE IS NOW LIMITED ONLY BY YOUR IMAGINATION!!!