You'll definitely need to read the enclosed "Read Me" on this one, but in the meantime...
NOTE: The following maps are truly the stand-outs which deserve your special attentions: Home Pfhor the Holidays, Milestones, Pfhor a Few Dollars More, and The Woolen Mill. While the rest are absolutely fun and great in their own rights (or they'd not be here), these mentioned four are the cream of the pack (in the opinion of the converter...your mileage may vary, of course).
The Vol. 2 maps are:
Enjoy your carnage.
In the original Marathon 1 game for Macintosh, there is a white screen flash fader that happens when you teleport in. I created a .lua script to emulate this behavior. Installation instructions included.
This is an initial version that works perfectly fine most of the time. However, if you manage to shoot yourself across a map at a high rate of speed (i.e. from a rocket), that may falsely trip the teleport detector.