G'day all. When upgrading a 1960 Beetle motor from 1200 to 2110, what RTA and or engineering hoops do I have to jump through?

a lot. it use to be engineers reports and then an engine change at an avus station. don't know now. ring the mta
from their website
http://www.rms.nsw.gov.au/roads/registration/get-nsw-registration/modified-no...

they would make you upgrade your brakes for certain

Yep. I have started reading the RTA paperwork and found that brakes must have an Engineers report if you go over 20% increase in power. That is just the start!