Rules & Guides
Membership rules: see the Constitution - International
Measurement certificates: Australian Sailing - International Class Boat Registration
The various sailmakers have tuning guides that may help you when setting up your Etchells.
Towing your Etchells on a road trailer
There are specific, often strict, rules in each State for trailers and towing given the large size and overhang. Please check your State transport authority for the rules so you stay legal.