60mm rail mount for drone accessories

I made this simple rail mount to roughly match the dimensions of the one included with my S550 hexacopter frame. This should clip onto standard camera/accessory rails that are 10mm, and 60mm center to center. It has a drop of about 25mm, and the flat mounting point at the bottom is 30mm wide, and has a pair of 3mm mounting holes, 15mm center to center.
I intend to use these to mount all sorts of stuff to my frame, from the GPS mast on a pair of inverted ones at the back, to an emergency chute