In my opinion the .188 wall tube may be a little overkill for what you're doing.. Not bad for the 2x3 stuff as it is likely used in heavy duty areas, but the 2x2 doesn't need to be that thick.
Also 40ft of it seems a little much as well for the 2x2 and 2x3.
Steel flat stock is usually good to have for little brackets and such, and it's generally cheap. 1/8" and 3/16" thick mainly.
-Dale
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