Hey gang, managed to get my hands on the Japanese Marathon Trilogy discs. This .rar archive contains two ISOs: one for the Map Collection disc and the other for the Marathon Trilogy disc. https://mega.nz/#!OthzTABQ!6Shpp379VvzCQe4fkBjreQHd7AlVnQmDfZmvNaA85Lk I don't know if there are any differences to the American/Western release, but there are definitely some interesting net and solo maps including E1M1 from Doom! To get the maps running in Aleph One, try changing the file extensions to .sceA. I tried it with a few maps and it seemed to work, but I have no idea if it will work with all of them. Changing the physics model files to have the .phys extension should get them working as well.
Correct. But the maps from the Map Collection disc should work under Aleph One on Windows, Mac, and Linux, so you won't necessarily need a PowerMac for those. https://alephone.lhowon.org/