More suggestions for improvement?
Haha maybe name it “OpenRaceCopter” 
more holes, for easing customizing?
Slot the second hole on the legs in an arch for more adjustment to weight distribution
Front arms one piece, back arms one piece. Only 2 screws needed.
@Fabian_Schurig This is awesome. Are you putting this design on thingiverse?
@bcrazycramer
Yes, I will upload my source files, too. But first I need to improve it, add additional suggestions I collected and then produce at least one to test it.
@Fabian_Schurig I’m looking to print the hull here in a bit, if you want me to beta print the arms I can give it a try. 
Nice work. I’m enjoying following your progress. What CAD tool are you using? What are you using to 3D render?
I am using Autodesk Fusion 360 for both, modeling and rendering.
If you included a variable-angle mount in the hull for the board camera, it would be a good quad for learning to fly.