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Consider making that pen out of the metal electrical conduit because you can easily make bends at the corners as well as/or utilize fitings made for them.
That is one great question... however there is NO one answer. What will work great in your neighborhood will be foolhardy in mine. You may have green grass and rainfall spread out throughout the year, with lots of bugs, while in my backyard it is quite HOT and arrid with rain only for 4...