Around -1248, 13328

Around -5632, 648

I'm using the latest svn and...yeah I don't know.

I aligned all these textures as you can see here BUT in the GZDoom 3D mode they appear completely different, and thus in the game they are aligned completely differently. I can't align anything in the GZDoom 3D mode so there's really nothing I can do about it. The metal walls around the area were also fixed but don't appear that way in-game.

I also couldn't get the wooden bridge flat on the red castle area to rotate the right way. It probably needs to be done through a script or something but I'm no good with that. Changing the rotation property didn't do me any good though.

Recent SVN of GZDoom or ZDoom?

Last I checked the fix hadn't gotten into GZDoom yet, but I've been out of the loop for about a week.

I haven't figured out what's caused the weird skyHOM in that hell area, but the other issues have been fixed in my build and will be online at some point in the near-ish future. The supertall polyobject is just due to not having a recent-enough (G)Zdoom version, so it's implicitly fixed.