I'm currently working on a new version of the Necromunda Files for AB3 (Yay!)
It's been a while coming (and it is still a few weeks off) but it will contain all of the info from the LRB and the "offical" PDF's available from
www.specialist-games.com
Once that's done and released, I'll add all of the stuff from the old rules so you can choose between Necromunda (original) and Necromunda Underhive.
At this stage, I don't have any idea when I might have a chance to update the ABv2.2 files to reflect the changes in Necromunda Underhive...