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The reason for the 45º angles is that I learned via experimentation, that corners & dousing do not mix well. Oringinally I didn't have a complete loop, just 3 sides like the top you see here, then lashed to the deck. The corner between that & the deck was sharp, just open pipe touching the deck, and the kite always bunched up & got pinched there, and stuck. A square *might* work, but this does a better job of approximated the deliberated curvature of the factory tubes.
Here you can see the tension line running all the way back to the mast. The hooks pull forward & outboard, and this pulls back. Together they make a triangle of force that keeps the loop in place. But there is a better way... read on...