TheHindmost:
We didn't weight it but it has app. the same weight as the camera mount only.

SkyHigh:
We where also concerned about the thread shafts so we clued the profils to the battery tray to give the whole thing more strength and to distribute any impact force to all the vertical risers more or less equaly. On our first test flight we had some hard landings (even on only 2 of the balls) due to some wind coming up without any damage. The highest "hard landing" was from app. 3m and everything was fine. We only want to use it for low level flight training until we are more confident in our flying skills so it should be ok. I will try to post a video from last weekend (short one though)