Graeme,
Hi mate.
Welcome to the forum and the first of your big decisions.
Mmm wait until you start thinking about colors...
I think the advice of attending meetings and looking at cars under construction is good.
400TT - Craigs advice is right in that you don't want to get caught with an engine that is not 2008 ADR emission compliant.
The NSW gang will give you accurate advice in this area. It is timely that you ask these questions and I don't think any of us would be at all concerned with your list of questions - just keep asking.
I don't stay up worrying about cars, I sleep like a baby - sleep for an hour and cry for an hour.
Good luck with your choice.