So I've just done this. I had a BA Future wagon with traction control, so this took a lot of work. If your wagon is a BF this will be a lot easier. You have to convert the car to a BF from an electrical standpoint. I used the floor/rear harness from the BA wagon and changed everything else. I changed:
BF dash harness
BF engine bay harness (x2)
BF engine harness
BF indicator and wiper stalks
BF Accelerator and brake pedals
BF RCM, IC, BEM, PCM, ABS, TCM (its inside the ZF6)
Aftermarket ICC. Use BF one if you have standard.
BF sunlight sensor
BF 2.73 Ute diff
Custom tailshaft.
The floor harness needs to have a couple of wires added for the zf6 shifter. Review the wiring diagrams for plug C-318. You add 4 wires, 2332, 57ER, 687T, 19H. I pulled the wires from the BF sedan floor harness I had and inserted them into mine through each connector so it looks factory. A lot of people just add them exterally.
I found an ABS unit without stability control which suited my Future with traction control (this means I didn't need the YAW and steering sensors). If you dont have traction control you need to add an extra brake line to the rear. You also need one of the aircon lines from the BF to fit around the new ABS unit
I found I had to use the BF RCM as the BA one threw a configuration fault despite only being on the ISO bus.
If you use boost control from the PCM then you need to add the wires for it and the boost sensor. I did both.
You don't need to change any plugs. I had to add wires to existing blank spots.
I got it driving just this past weekend and its sweet. Only problem so far is a wire missing from the RCM to the Dash for an audible alarm, so I will have to track that down.
Thats about as comprehensive as you should need.
Have fun!