Automated WordPress Installation Script?

automatically set up a WordPress site based on an existing site that I’ve already set up including custom themes, plugins, etc

What exactly do you mean by existing site – a WP installation or another kind of site?

An existing WP installation…

Thanks,
Benz12

Bump

Hi, I wrote up a blog post on this topic recently. Hope this is useful to you:
https://www.superwebdeveloper.com/2009/11/07/installation-script-using-wordpress-subversion-repositories/

I understand also that drupal has a tool called drush, which I understand just became useful recently.

Some tools like this would be good for WP. It really cuts down time to build and launch a site.