You have a few options to download the Minimal Desktop for Ubuntu script (to work on). The best location to get the latest release version of the script from is the Launchpad. If you want to work on the latest and greatest (ie. the nightly versions of what I'm working on), check out my personal version archive. The PVA gets updated every night at midnight EST (5:00 UTC). To automatically download the latest testing version, run
wget http://minimal-desktop.sublevel21.com/latest.sh
in the Terminal. To download the latest stable, run
wget http://minimal-desktop.sublevel21.com/latest-stable.sh
in Terminal. Additionally, you can download MDU from Softpedia, but this version is usually a little behind.
We're always looking for experienced shell scripters, graphic designers and Web designers. To submit code, or get involved with the project, contact me on Launchpad. Who knows, maybe you could learn a thing or two (like I have).