The engine and auto wiring is standalone,I prefer it that way.
I have separated the transfer to 4WD ecu wiring out of the surf loom, it will still plug in under the dash.
I have only had a quick look at the diagram, but the only other input I can see that the 4WD ecu needs is a speed signal.
I'm guessing your 2 days included the engine and auto wiring, the 4wd side doesn't look that complicated (compared to Triton's and Rodeo's).