20x20mm frame tripod clamp for RigidBot or any other frame

This 20x20mm frame tripod clamp designed for RigidBot.
But can be used on any other 20x20mm metal bar.
Clamp is used to attach camera equipped with standard 1/4x20 threaded socket. Current design can hold only fairly light camera, like GoPro.
Reinforced design will be developed.
Has slots for 4 x 6-32 (or M4) nuts
Designed for 6x32 bolts, M4 will works as well.
To make one:
Get from hardware store 4 x 6-32 or M4 nuts and bolts
Get 1 x 1/4 x 1/2 hex bolt (Doesn't have to b