In some other communities, there is a type of art game called an evo game where contributors make evolutionary descendants of previous species entries. Sagan 4 and Janjira are some notable examples. I noticed that the oekaki's system for editing other people's artwork, showing the art it was originally based on and a gallery of drawings based on itself, could be used perfectly as an ancestor/descendant system in an oekaki-based evo game.
For an oekaki-based evo game to work, both the original post and all "descendants" of that post would need to be editable by either everyone or a list of project members. What would be the best way to set this up, and where would it belong?