The mounting plate itself is built from a piece of 1/2″ MDF. I traced around the bottom of the projector, cut it to shape using a sabre saw, drilled the holes, rounded the corners and edges with a file, and applied a couple coats of black spray paint. Four holes in the center of the plate are fit with T-nuts, on the underside, to receive flat-head bolts passing through the horizontal pipe flange. Two holes in the front corners of the plate allow attachment by machine screws into threaded hard-points in the bottom of the projector case (which is the top, in this configuration, because the projector is mounted upside-down).
The back edge of the projector is secured by small aluminum binding triangles, shown in a detail photograph in the gallery, below. Each triangle has three screws—two with “wood” threads that secure the triangle to the back edge of the mounting plate, and one with “machine” threads that mate with threaded hard-points in the back side of the projector case.
The mounting arm, obviously, is made from pipe fittings. I believe these are nominal 1.5″ diameter. The horizontal flange is connected to a 90-degree elbow by a short nipple. The elbow, from there, is connected to a longer nipple and then to a second, vertical pipe flange which is secured to a wall stud with wood screws. Power and video cables are would ’round the mounting arm for strain relief on the connectors before running off to the wall outlet and the video source.
The mounting operation consisted of 1) attaching the mounting plate to the video projector, 2) attaching the mounting arm to the wall, 3) attaching the mounting plate with projector to the mounting arm at the horizontal flange, and 4) attaching the running the cables. The only major drawback of this design is that it does not easily allow for adjustment of “pitch.” As can be seen, a pair of fender washers “shims” had to be interposed between the back edge of the horizontal pipe flange, and the mounting plate, to lower the back end of the projector and raise the image projected on the opposite wall. Otherwise, the mount has worked out just as I’d intended.