A 2×4 to the metal frame? U straps. You use them when you’re putting up a wooden fence with metal poles.
I would advise building the frame or base first before tying them to the metal poles. Depending on the give of the metal structure it may cause the wood to be out of square.
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I did this and the only problem was venting it. Even in the winter can get over 100 degrees.
[https://i.imgur.com/h3YwEvO.jpg](https://i.imgur.com/h3YwEvO.jpg)
A 2×4 to the metal frame? U straps. You use them when you’re putting up a wooden fence with metal poles.
I would advise building the frame or base first before tying them to the metal poles. Depending on the give of the metal structure it may cause the wood to be out of square.