Gary
I just have to say the flat bar braces on your hoist are wrong flat bar in compression is useless tube, pipe, angle, yes but not flat bar.
For example take a 1x1x1/4 angle 12 inches long put it in a press on end it will take a butt load of force to compress put a 2x1/4 flat bar 12 inches long in the press and it will deflect (bow) with very little force.
Bob