We are looking at getting a feeder pig this spring and I'm curious about building the pen. I have read all the stuff about building pens with electric and all that, but we are wanting to build it while spending as little money as possible while still being secure. We have a grove of big pine trees that are spaced out 10-15 feet apart. We also have a wide assortment of cattle gates and heavy duty coral panels. Would it be good to use the trees as my posts and attach these gates to the trees in a fashion to make the pen? I thought about Rachett strapping the gates to the trees in a very secure way, and if the gates had a big gap between tubes on the bottom, attaching 2x4 from tree to tree at the bottom to fill the hole. In the places where it would take 2 gates to reach from tree to tree, I would put t post against where the gates overlap to secure it. Thought?