I fixed the rebuilt ISO for this so that it will boot correctly on a PS2 debug station when burned to CD-R. I also discovered that the split-screen mode actually works when launched from the dev console (not the single-player menu, though), even in PCSX2, and five of the six maps can be explored. They're VERY early versions of what I think are parts of Seattle.
Twisted Metal: Harbor City (Prototype) - Hidden Palace
hiddenpalace.org