Thanks, tlaloc.
I've been looking at other modular stairs and their text files, trying to figure out how to 'fake' it.
The ones I've found over on MTS2 have a separate text file from the instructions text file, with lising of object data GUIDs and then one other number I can't decipher.
I'll go hunt up the instruction files over at TSR and see if the needed numbers are in there. I wouldn't have thought that they might be there because of how MTS2 has theirs set up, or at least those I've looked at. So thank you for your input!