This is what I did for my 6 foot high 10 foot long dog run chain link panel pens to support the hardware wire roofs covered with shade cloth.
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The panels of the pens are connected with these pipe clamps.
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To support the hardware wire, I used PVC pipe the same diameter as the panel pipe.
These were connected to the top pipe using connectors that look like these. This connector allows you to make a T . The clamp can be adjusted to different angles.
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While my tops are flat, a steel fence pipe could be used to run a peak line and lengths can be cut to make your "rafters"
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I purchased all my hardware ... Clamps in the fencing section of my Ace Hardware store. They also had the lengths of pipe.