User knoptop of Instructables came up with a video to show how you can make an HDSLR shoulder rig from PVC pipes.
For the most basic configuration all you’d need is a bunch of PVC pipes and fitting and a conduit box.
If you want a little bit extra you can add insulation foam as padding. I really like these kind of projects I wish we’d see more of them.
And of course, if you are not into PVC weird is a way, you can always make a camera rig from an IKEA cutting board.