That's not my run. Here's a smaller one of mine using the same technique as my 10x30 run. The poles slide into special fittings at the top and are secured to the run by brackets you can get at places like Lowes (I guess you already have these).
The carriage bolts that secure the brackets to the run point upwards so that the cattle panel can rest against the nuts (You will probably have to buy longer bolts; I used galvanized). Then a washer is placed on the bolt over the panel and secured with another nut. The cattle panels are wired to the slanted poles. The netting at top was necessary because the panels are only 50 inches wide (they are 16' long). Chicken wire or hardware cloth would work as well.
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