X580 battery tray

This is a new thing in series for Hobbyking X580 quadrocopter.
I designed battery tray for Zippy Compact 4000 mAh battery.
Tray supposed to be mounted up side down. Support rings on top and should be slided on two 12 mm carbon tubes of frame. Tray should be below. Velcro and/or hook and loop should be used to fix battery below the tray. Two additional holes for screws to fix tray to existing frame parts (clips which holds shelfs on tubes).

You will need 6 M3x8 screws with countersunk heads