cp:; I had misunderstood your earlier post about the strongest direction. If the beam is strongest with flanges on top and bottom (rather than on the verticals) then I can't see that I can have much to worry about as far as flex goes.
BTW, got the two remaining gussets welded, the fact plates cut and one of them welded. Will weld the other tonight. then, on to cutting steel for the anchors and push plate asemblies.