If you're just interested in printing your own, just download resources/tent.stl and feed it into your favorite software for 3D printing.
If you'd like to contribute, I'd prefer you make changes to the original Clojure source. I've also included the generated SCAD if you want to experiment and don't have a Clojure environment set up.
All source is distributed under the Eclipse Public License either version 1.0 or (at your option) any later version.
The tent design and all images are released under the Creative Commons Attribution-ShareAlike 4.0 International License (CC BY-SA 4.0)