I made the links and the wall mount board, and assembled it for the first time today:
The first lesson I learned is that it will take two barrel bolts to lock this in the "UP" position. With only one it twists very badly, which is obvious when I look at it. But, the concept seems to work just fine. I can't photograph it in the up position now because I don't have enough hands to hold it up and take the photo too. Tomorrow I will mount this on a piece of scrap plywood to simulate the wall, then install the barrel bolts. My costs are now up by another $9, plus $15 for contact cement for the veneer and a can of Rustoleum paint for the links.