I originally had it available as an "open-source" version that you want, but removed it for some reason I can't remember.
I'll repost on my site tonight when I get home (about 5-6 hours after this post) for those that want to inspect it without unpacking the PBO.
How did you mean you can't get it working?
What happens when you try to run it?
Any errors?
To install the pbo version:
Drop the PBO into the SinglePlayer missions folder and it will be available in Single Missions option of the main menu.
Hope this helps.
If not, check my site in 6 hours or so, and you'll see an 'editable mission' download for it.