No RB? I have a sad on.
But in all seriousness, sounds like you're still motivated after getting screwed around a fair bit, which is great.
Keep us posted.
The problem with removing the turbo (other than making something thats slower then a PROPER NA Skyline) is that it's registered as a turbo, therefore, still illegal to drive on your P's without exemption.
Just an FYI, the pass is closed from the 12th of March to some date I can't remember (will check sign tomorrow).
Also, the 11th is the day after the Robertson Show, so possible extra traffic (horse floats etc) going down the Pass.