I'm not sure if this was suggested already or not; if it was, then let it be a sort of reminder.

The actual Deconstruction Zone elevator icon is indistinguishable from Mechanized Mile one. That is slightly confising, and makes you check the gate map constantly, especially if the two follow each other in a row. I'd suggest to represent DZ with "lair" icon instead (the one we have for Lichenous Lair and Devilish Drudgery). By its contents, this level is quite a lair of gremlins.