Don't go through all of this trouble. Read merlyn's article titled: Mirroring your own mini-CPAN. Modify the script to grab only the modules you want to mirror. Then have all of your individual installations update from your mirror.

Update:: I forgot to mention why you might want to do it this way -- you would want to run new modules on a development instance to ensure that they don't break your existing code before you allow them to be replicated around to your other machines.