Welding up my own square tubes from Grade 5 Titanium.

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Hi everyone. New member here. Been lurking for a while but i finally have a question that i couldn't find the answer for.I need a couple of square or rectangle tubes with the absolute highest specific strength possible. About 2"x2"x 5' (50x50x1500mm). 6-4 (Gr5) Titanium would be the ideal material for this purpose.However, square 6-4 tubing doesn't seem to be available anywhere. I've contacted lots of titanium manufacturers directly (in China, India and US). None of them stock anything similar, and they all have a huge minimum order quantity to produce it, not to mention an absolutely insane cost (about 15 times the cost of bulk 6-4 titanium stock)So this idea crossed my mind.. What if I just took 4 flats and welded them together along the entire length into a square tube? Would this be an absolutely horrible idea (for some reason that is above my paygrade), or would it actually work? I do realize that it'll be a lot of welding, but I'm OK with that considering that i only need 2 pieces. This will be part of a frame member for a custom race car, so while not exactly critical, i do want to retain most of the tensile strength of the 6-4 Ti.Thanks!