Re: First experiments and I already need help :(
Ya… you don’t want to do that. You local config file will be different of course and there are a number of domain references in the DB (not thousands mind you… but more than one or two). Also, WPMU creates the config file for you upon install and you mess things up if you swap it with another.
A config file would never be kept in a repo I don’t think.
To answer your last question, it is easy to move things to other folders but everything will break :o)
Why would you ever want to mirror all those core files anyway? The only place you would be doing your own development would be within the theme.