Caddx Nebula mount for Vista (20x20mm)
thingiverse
I'm building a couple of Nebula mounts for a 20x20 stack. On my digital toothpick build, I use the HGLRC Zeus AIO FC+ESC board and Vista above it. The mounts will sit on top of that setup with a 3mm thick frame. To assemble them, I recommend using a 25mm M2 screw; it's just long enough to have some thread left over for nuts if you use minimal spacing between the frame, AIO board, and Vista. I've also included an .obj file for my rough Caddx Nebula model, which I created mostly from the promo image. To ensure accuracy, I confirmed the screw hole center distance from the back (7.5mm) and lens front distance from the screw hole center (12.6mm) with Caddx support. This design should be good enough for you to work on your own custom version if needed. I'm currently working on a full canopy version with some antenna mounts, and I've included a sneak peek of my progress: 
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