There are other private servers for PSO around, including my Sylverant project. I can tell you that in my experience, its a whole lot easier to figure things out by looking at packet dumps than by trying to reverse anything from the game binaries itself. That said, I don't know of any resources for packet dumps from Alien Front Online or Outrigger, so that option may not even be possible at this point.
I don't think you'll find much by reading the level data, you're much more likely to find what you want by disassembling the game binary itself. That said, it can be extremely difficult to follow the stuff that disassemblers put out, especially if you're not experienced in doing so. I wish you all the luck in the world at doing what you're attempting to do, but I doubt I'll be able to offer any assistance beyond that.
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