Ron, I have it well bolted to the concrete, 6" square footpads with 4 lags in each of the 8 legs. The pipe is 1-7/8" schedule 40 steel, so it can't flex more than an inch in any direction. It's 30'x16' and about 13' high, so lots of clearance if I park it on target.
That sounds great!
Something inside me says it would be good to reinforce the frame better. I am thinking of an "X" cross brace on the back wall and center sections of the side walls, made of conduit. This to prevent the structure from twisting in a bad storm. Flatten & drill the ends of electrical conduit for bolting. The "X" does not have to go across the entire wall. Just inside the center sections and back wall, and a small horizontal cross brace up high between adjacent walls. The intersection of conduits that make the "X's" you could flatten & add a bolt there too. It would surely stiffen up the structure.
Maybe I am over-engineering it, but I fear that gusty 60 mph winds could mess up your rig. Check the website of the manufacture of the canopy. They might offer an additional kit to do this very thing.
I just browsed the web but did not find an example. Maybe my idea is not commonly practiced at all.