I really only need the fuel maps, I am trying to get this thing to pass emissions, and it fails in the high speed when it goes off closed loop control.
I'm not very familiar with these ROMs and making defs, but if I were, I would find the closest looking def and ROM, and line the 2 up in a hex editor, manually editing the def XML to suit the new file. It should be pretty easy to locate fuel maps based on the 'reference' ROM and def.