That's honestly one board, technically 3, that I never did mess with getting scans of. The KATANA SUB BD 01 (VA0) and the KATANA SUB BD 2 (VA1) are both single sided PCBs and there isn't really much going on there. Even the SUB BD VA2 (VA2.1) is pretty much single sided, even though it has a top layer but that's just all ground.
The VA0 and the VA1 schematics have the SUB BD 01 and SUB BD 2 traced out in there, it's the little circuit kind of all by itself almost right in the middle of the whole mess, CN1 is the ribbon cable connector, on there and CN1A/CN2A are the controller port connectors.
The SUB BD 2 and the SUB BD VA2 are technically the same and interchangeable, but that SUB BD 01 that is used in the VA0 can only be used on it, without modifying things.
EDIT: Added the VA1 and VA2.1 Sub board PCB scans, bottom side only for now, but there isn't anything going on top side trace wise really.