Camera secured at both mounting screw and hotshoe to prevent flex and rocking when using a follow focus.
Ability to quickly and easily remove the camera from the cage incorporating an Arca Swiss clamp inside the cage which would also solve my next wish:
Absolutely no camera twisting! I hate camera twisting!
Easy access to all camera controls, ports, battery door, etc while camera is mounted in the cage.
All holes spaced to the ARRI and RED standard to allow use of professional quality accessories.
A built in rail block that mounts the cage at the correct height above the rails and prevent the camera and the cage from rotating on the rail block. Have I mentioned I hate camera rotation?
A cage that will allow me to upgrade my camera without having to buy a new cage.
There's more pics and more thorough write up on my blog: http://tvpglabs.com/...-berkey-system/