Wow, this is pretty impressive!
Though I hope you understand that by showing this to the masses, it is now subject to phallic and other equally (or more) offensive drawings/prototypes.
Ha, you're right. I like to think it's an interesting first-run experience though :)
I should mention the owner can control this. So If you want to embed these on your open source repo, you can make the Precursor doc read-only so it doesn't get ruined.
Just open the menu in the top-left, select "Sharing", and then "Read-only" at the bottom.