I've been using the SmallHD DP7 and loving it, but it's pretty heavy. Using it on top of my GH4 with a hot shoe swivel head is clunky. It falls down all of the time. Comes loose. You name it. I searched the market for anything that would attach both sides of the monitor allowing for swivel, and a sturdy grip. Found nothing. I decided to build it myself out of parts found on eBay, and B&H.
Here are the links to parts I used:
CAGE: http://www.ebay.com/itm/FHUGEN-HONU-V2-0-VIDEO-CAGE-Kit-with-Top-Handle-HDMI-Clamp-for-GH3-GH4-A7-A7R-/231302638084?pt=LH_DefaultDomain_0&hash=item35dab6