How do I migrate root user having only HD

I finally took the plunge and ordered a MacPro quad 2.66. I am waiting for it, and in the meantime I might sell my Dual g5 1.8. The problem is that like this I could not transfer the files from one mac to the other. Second problem is that I run my machines as root in order not to have to deal with any security question (I know, it is a bit reckless, but knowing nothing about unix I started like that with the G5 5 years ago...), and I see that everything is in hidden files/directories that cannot be accessed easily (I thought I could enter in the new machine as root and I could access the root user data on the other disk, but it doesn't work, I tried on another machine).

Is there any clean solution that allows to move one root user from one disk, installed on the Pro, to the boot disk. Otherwise, any unclean (i.e. scripts etc)? Finally, in case I decide to keep the G5 (or if it is the only solution, forcing me to keep it for the time being (and losing this occasion to sell it, since it is now or never for this guy)

Thanks for any help

 

Is this short for "nothing can be done"?
Why is it so bad? I do not care about my family seeing my files, and I really want an experience like OS9, is there a way?
And about the migration, if it has to be manual, is there a guide of which files and where have to be moved?
Someone told me there could be UNIX scripts to move entire blocks of data, anyhing around?

Tx