brendanf, good point.
as far as my understanding goes, we are principally united by these forums. end of story
looking further into it-
consistencies in all states such as stickers, shirts & name variations (eg. Skylines Australia NSW - Skylines Australia VIC etc). this pretty much covers our identity to the public thus portraying an image of a nationaly collective group
other consistencies, like the club charter, code of conduct & terms and conditions, also show that we are of the same organisation albeit a seperate entity. small discrepancies in the club charter will arise due to the different laws each state enforces.