This is for the folding table in one of my other posts here.
It's made from garage door track, random hinges, random scrap and the roof skin from a fire-damaged 2001 BMW touring.
I know that I should have boxed the shell in first, but I wanted to build the frame first for no rational reason. It worked out well enough.
These turnbuckles hold the top open and closed. The handle doubles as a place to park the grounding clamp.
Bonus: I made this greazy corner welding jig so that I could tack the inside and outside: