It looks like it would be pretty easy to fab four posts on a system like that with some drilling through the cross members and some heavy duty u-bolts or through bolts depending on your posts. There is not much to a canopy and sure you could find a local welder to build a frame for only 2 posts, but any gusts much over 20MPH and a canopy is more like a kite or sail. I had a four post built out of aluminum from Hewitt docks for <$2G, but went with a sheet metal roof instead of a canopy. (see profile)
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