The Fence Genius Software Driven Production Pod is highly efficient and enables the best of quality. Thanks for noticing it can be in a 20' High Cube shipping container or a trailer of similar size.
Thanks for your question. If you look 18:30 into the video you see the top and bottom rail the boards are nailed onto and there is a 2x4 cap. We build panels to go between posts and screw each rail to each post with 2 - pcs 4" #10 Exterior Screws through predrilled holes that we drill in the process.