C2D Penryn success!
Got my MacBook Pro 7,1 up and booting Sonoma from external USB flash drive, used OCLP version 0.6.7 for this test.
Currently, USB1.1 (trackpad/kbd) and sound/audio works, BT & Wifi does not (yet).
edit: MacBook Pro 8,1 (i5) also capable of booting into Sonoma. Same outcome as with the 7,1, except that even frame buffer for the Intel graphics is missing (3MB). On the 7,1 Nvidia shows up with the 256MB of buffer size.
edit2: MacBook 7,1 (non-pro, white polycarb unibody) also working same as above, frame buffer for 320M fully shown.
edit3: MacBook Pro 5,1 boots also, even screen backlight is dimmable via function keys. Had to spoof machine type to supported iMac Pro, though. Wifi/BT not working, sound/audio does work.