Puppet-Dashboard is available in github @ https://github.com/puppetlabs/puppet-dashboard
Setting this up via an ebuild would be very nice. I've done the install manually, and the one thing missing is a non-lsb init.d script, which would have to be written.
Provided lsb init.d script: http://pastebin.com/RERpgA7S
If someone could at least convert this to gentoo style that would be amazing. :)