Habbycam have brought out a DSLR Cage for 5D and 7D camera shooters. You will be looking at forking out $469 for the cage.
The Habbycam Cage is designed to work with the Canon 5D Mark II and Canon 7D DSLRs. The Habbycam Cage allows the digital filmmaker to mount Monitors, Wireless Microphones and any other accessories while protecting the camera. Use the Habbycam DSLR Cage to protect your valuable Canon 5D/7D from damage by surrounding it with 3/8″ aluminum “cheese” plates. The Habbycam DSLR Cage is also a great way to increase the DSLR’s mounting rigidity when used on car’s, boats or other moving objects. The bottom of the DSLR cage is opened for battery access on the Canon 5D MKII and Canon 7D.
See the Habbycam 5D/7D Cage here.