I need as much documentation on the hardware of these machines, but especially the PPC turbo cards. The ECS and AGA chipset documentation will also be appreciated, as well as the Zorro 2 and 3 bus.
I think you'll have a hard time finding info on the PPC accelerator cards.
The system schematics you should be able to find quite readily. I'm sure I've seen a copy of the system architecture docs for Amiga before, Zorro specs included. Google a bit and I'm sure you'll find them. I haven't seen A4000 schematics specifically, but I have downloaded A1200 schematics before, so I assume they should be available as well.