I've spent a month going back and forth with openhornet.com, the site is nice to look at but I haven't really found anything very helpful. I suppose the main problem is that I'm not an expert in Fusion360. Maybe having the obj file for the framework on the github would help, as those are what I spent a week fighting with Fusion360 to figure out how to select what piece I wanted and convert to .obj so I could then turn it into something Lightburn could use via conversion in Tinkercad. Seriosly, it's been a pita...
This is where i'm at. Due to frustration, I just took one of the '"rib" pieces and made a template to copy/cut for all of them so far. The panels I made with my CO2 laser out of cast acrylic, 3x - 3mm layers of Black & translucent White.