Family Guy Video Game (PS2)

[SpongeBat1]

So I've actually managed to extract content from the game's WAD file, yet I cannot figure out how to convert/extract/open the .PSM or .PSS files within them. The most information I've gotten from the internet are that this game apparently uses a similar file format to Bionicle: The Game and The Conduit, and that PSM files contain level geometry and PSS files contain textures/models/sounds.

This post goes into more detail on PSS/PSM files, but "conveniently" neglects to mention what program/language they used. Here is a sample .PSM (of the Griffin's house).