The problem with this crane project, is it's the only project I really need a crane for. It's quite the chicken and egg problem.
Bunch of welding done this afternoon. By design it's pulled in just a little in the middle. (It's upside down in this photo). When load is applied to the yet to be built carriage that carries the chan fall, it will tend to spring out some. It's about 1/4" in on the middle compared to the edges, which seems about right.
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Not I gotta flip this over, without disassembling it. Somehow, I think the car lift will be involved.