@libreleah sounds great! Good luck!
Last question: Do you have plans for supporting ThinkPad T60 with ATI GPU in os-boot project?
I made a Coreboot image with ATI support for it a long time ago with SeaBIOS as a payload. Clean GRUB2 payload didn't work (no image while booting) but SeaBIOS+GRUB2 chainload _should_ work. If you interested I can translate a guide for you