This build is made up of only new cod files to be copied into an existing OS installation. If you plan to shrink your OS (which I highly recommend) you need to do so prior to copying these files into the Java folder.
OS shrinking is a matter of personal preference and different carrier requirements. I personally do not need any language files except US English, so I remove all language files. I remove all games, all fonts (except latin_truetype, which is required by the OS), all themes (except BlackBerry6, again a required file), and basically everything I possibly can remove.
Here is a screenshot of my shrink settings in BBH Tool:
Click to view quoted image
After that shrink is complete, I also manually remove several files that I know are not necessary.