Okay I decided to proceed with the legitimate approach, submitting an application to the transport department so I could have the mods registered and satisfy the brake shops need to have it all above board.
I couldn't get any documentation from the supplier (things like the cylinder pressure test reports etc) so I submitted the application myself trying to sound as much like an engineer as I could. I contacted the authorities a few weeks ago to see why I hadn't heard back from them after six weeks (applications take 1-2 weeks) and surprise surprise they had contacted Haultech and were waiting on them to respond to their request for some additional info.
I must say I'm impressed they didn't just flat-out reject my application based on insufficient documentation, but went to the bother of phoning the contacts I listed for the supplier and installer to try to get the thing approved.
It's a shame that the company that sold me the kit can't be bothered to provide a few bits of info so I can actually use the product I paid for nearly 4 months ago. I know that the Traction Control Kit is not their bread and butter but rather more of a hobby project that was supposed to take off one day, but at this rate I don't think it ever will if they are not prepared to support it properly and therefore I'm not going to recommend it to anyone either.
If I had the chance right now I would definately take my money back, but I think at this stage i'll just have to wait to see how it plays out. If I do get it up and running I will still be left a little sour from the experience and next year my main 4wding location will become permanently inaccessible so I won't have much use for it either. This was to be my treat for selling my GTR (2 years of mod hell finally over), I should have learned my lesson.