I’m planning on continuing with this project. Right now the most obvious thing to do is to design a new box that’s easier to assemble and more water resistant. I think that can be done by using vinyl or duct tape rather than traditional box-making methods.
Then writing and testing directions, both through direct user testing and submitting versions to instructables. I like the idea of putting together a PDF with directions and simple illustrations that can be printed out in color or in black and white. Eventually it would be great to make an instructional video.
Finally, thinking more about it something like a kit would probably be valuable as well I know that Window Farms started as a DIY project, but really gained traction when they Kickstarted a kit you could buy.