I am "closing in" the area under my deck with lattice panels. Each panel is 40"wide and 70" high and framed in PT 1x4s. I need a doorway in place of one panel section. I tentaively plan to make a rectangular frame out of PT 1x4s using half lap joints at the corners for strength. Hardware will be black strap hinges and a simple latch for holding the door shut. The hinge side of the door will be mounted to a PT 4x4 which will be secured top and bottom so the structure supporting the door should be fairly substantial. Anybody have any ideas for adding strength to the PT 1x4 door? Lattice panels and 1x4s are rather light weight, or am I overthinking this. Comments appreciated.