Hi Don,
I've just successfully worked through the process of constitution reform for another body, a national professional society, of which I'm secretary. I quite like the Associations Incorporation Reform Act 2012, which is Victorian legislation. The location of the office is immaterial: you can incorporate in Vic and have an office somewhere else. I agree that the ACT regulator is useless. The process of moving incorporation from one state to another is simple and I could advise on it. I'm aware of the alternative models for incorporation, such as a limited liability company, but I have no experience with these.
In a post above you mention that there will be expert legal scrutiny of the final draft so that it will be a valid, robust document. I have 3 comments on this:
1. I hope you have a trustworthy, competent lawyer who specializes in this stuff, because just getting legal advice guarantees v little, in my experience, apart from large bills;
2. There is no substitute for many pairs of careful eyes scrutinizing the draft, and
3. whatever constitution is voted in, treat it as a step in an evolutionary process. It may need further work in the future and this should not be seen as a criticism of the people currently working on the reform process.