I used some pieces of 1-1/4 inch square steel tube with 1/8" wall to make some adjustable 90 degree clamps that grab 1" tube. then i made a custom clamp with a

I used some pieces of 1-1/4 inch square steel tube with 1/8" wall to make some adjustable 90 degree clamps that grab 1" tube. then i made a custom clamp with a 100mm vesa plate attached. and 4 short pieces of tube with wheels attached. then just cut 1" tube to approximate size, assemble, and adjust. it rolls back and forth along both sides of the bed. I have it set about 3 feet above me, and I added a little shelf to hold a laptop and other crap, and wire tied a power strip to the side. bluetooth trackball and kinesis. its a bit odd, but its really nice to be able to work in a neutral and relaxed position. I usually only do lying work, sitting work, or standing work for about an hour at a time.