This is a WIP KiCAD project for a custom PS3 motherboard.
I don't know if it's realistic but just maybe it's possible to use a newer CELL and RSX together with the PS2 EE/GS chips, since after all it's just simple PCI between them.
Shoutout to the PS3 dev wiki, it's been incredible helpful so far: https://www.psdevwiki.com/ps3/Motherboard_Components
If you have high quality stripped board scans, I would appreciate a PR or an E-Mail with them.