If you caught the video showing some of our ideas for setting up a cage during NAB, you might have caught a small double bracket holding the wireless receivers on top. This bracket is slightly expensive on it's own, but proved to be really functional. Here's another option for anyone looking to mount several accessories to the top of your camera, or to some sort of light stand. From CamCaddie, this 'Flashner' is available from 4", 8" and 16" lengths giving you plenty of rail for as many accessories as you can think of.
With up to 16" of hot shoe mountable rail, it would be pretty sweet to use these for an entire top and bottom section of a DIY DSLR cage. If you want to know what other options are available, click here. Otherwise the version below is a bit cheaper for getting several accessories mounted in one place.