No worries, I was able to build a new one that works -- for anyone looking for the cable in the future the attached wiring diagram is correct but I had issues with two cheap USB to Serial adapters. Also Windows 10 64bit is fine, you don't need to find a windows XP computer -- I took a last generation Intel based MacBook and installed Windows 10 via bootcamp and it's working perfectly.
These are answers I struggled to find with google, hopefully the next person who stumbles onto this will have a slightly easier time.
F2000_ECU_Flash_and_Verify_v2_.pdf