juiceLink are now manufacturing brackets for DSLR cameras that can be made into quite a few different configurations.
They have just finished making the prototypes of their DIY101 and DIY102 Budget DSLR Brackets. The brackets are fabricated from solid aluminum bar stock.
Combined with a Manfrotto 323 Quick Release Plate the juiceLink DIY101 makes for a cost effective cage.
juiceLink are promising that they re-thinking the entire approach to DSLR accessorizing and rigs, and that way of thinking will provide you with more value at significantly lower prices.
DIY101 shown with 5D and Manfrotto 323 Quick Release Plate
For more info about the DIY DSLR gear from juiceLink:
juiceLink