The side latches to the top.  The Gauntlet has a Picatinny Rail for mounting accessories. A protective case for an iPhone has a Picatanny Mount that should work with the system.  A sliding latch locks the mount on the rail.  This is a first iteration design, and it has not been printed yet.  Sets are provided for the iPhone 4, iPhone 5 and iPhone 6.  Updates with instructions will be provided after the designs are printed.  Prior Art:https://www.youmagine.com/designs/printed-flat-raptor-reloaded-gauntlet https://www.youmagine.com/designs/raptor-reloaded-by-e-nable  https://www.youmagine.com/designs/zip-tie-tensioner-for-raptor-reloaded