You need all the '00' labelled folders. Install them first. Everything else is optional. Install the folders you want in order (01, 02 etc.) overwriting as necessary.
Only install the '01 Modules' if you want them. As you use Roberts body install '05', again overwriting as necessary.
All this is in the readme, albeit in a slightly confusing arrangement.
If you use OBMM, TheNiceOne has made http://www.tesnexus.com/downloads/file.php?id=25266 to make this process easier.
Again, read the readme, it has all the information you need as well as details on the race changes which are helpful when it comes to character design.