That is so cool!
I just love the fact that your who riser, matte box rod assembly and swing away all can be built with just hand tools and mayby a small drill press. I couldn't tell from the photos, but is there some kind of clamping ring under the matte box swivel brackets so that when you swing the box it stays at a constant height? Anyhow I'm calling my broker and telling him to buy me some Ilsco stock! LOL