For starters I am in NSW so this is in regard to the laws of NSW.

Soon I plan to purchase a shell which has likely not been registered for 3 months, and will certainly not have been by the time I have finished.

My question is how difficult is it to re register a car once it has passed the 3 months grace period for re registration? I have asked a family member who works for the RTA and she has told me I will need a blue slip, pink slip, and once I apply for registration at the RTA I will have a 99% chance of being called to the pits for an inspection. I may have mixed some of those details however, that was some time ago.

Considering my car will be substantially modified, are there other or easier ways of re registering? Any and all help and suggestions are welcome, and will be considered, ie dodgys, registering out of state and transferring etc.