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The weld was actually nice and pretty, but I got impatient and handled it while the paint was still wet so it looks a little fuzzy.
Tsk tsk - the rule of thumb after painting a fabbed part is to drink enough beer than you get tipsy enough to stop working on the car immediately after the painting and then ensure it's only messed with the next day.
I'm not really convinced that cutting out lots of windows in a wing upright is worth the effort. For every bit of weight you save, you reduce the lateral stiffness of the upright. To the point that you might window out a 0.25" thick upright to weight the same as a 0.1875" thick upright that's solid, but it only has the lateral stiffness of the 0.1875" upright with all the negatives of increased form drag due to the additional windows/edges.
I ran a bunch of FEA sensitivities and kept coming to this conclusion, even though I expected the windowed upright to be stiffer in bending. It all trended towards weight = bending stiffness. The thinner/solid uprights tended to be superior from a buckling/stress perspective as well, especially given the loading will likely not be 100% symmetrical across the upright longitudinal axis (i.e. sidewinds/yaw).
Of course, people kinda expect the windows as being critical "go-fast stuff."