Hey serp, try mounting a bigger plate on the face of your box and get some of those teflon chair leg sliders and mount them to the face of the plate touching the door. Use the threaded tube with lamp repair kits to run wire through for the center pivot then an inch or so above that center tube use a piece of all thread and bolt the top of the sconce through wall to top of box. You will need to slot that top hole the path the bolt will take when you turn the sconce of course. That should stiffen it up but if that falls through then a remote cable is a cinch to run. Hang a bicycle on the wall and run the hand brake cable through the wall. Squeeze the brake on the bike and pop goes the door. Lots of shit has a cable operated mech on it, mower, tiller, snow blower....also can disguise the pull start rope to do the same... weed eater, leaf blower....bolt it to wall n pa-dow.