Yeah, that's probably what's happening. I was trying to assemble this file since that's all I need out of it. It's included by this file in the master installer, but I don't see any additional ORG tags in that one that it would be dependent on, at least none that aren't for parts of the system I'm not using.
I haven't worked with EA much yet, just with writing ASM directly and pasting .dmps where I need them. The .event file at least has ORGs for the component .dmps so if all else fails I'll just try doing it that way.
ETA: Ah, figured it out. I was using the version of the skills patch that comes with FEBuilder and not the one built by the makefile in the repo. The offsets are totally different. It's working now!
EDIT 2: For future reference, there wasn't a freespace definition in the event file I was using - had to throw in this baby to get it to compile. Now it works with EA perfectly fine.
#define FreeSpace 0xb2a610