I'm working on a 27" radius half circle panel that will go on the inside of a window flat against the glass. (I can send you a picture of panel pattern in the actual window) The panel will have 3/8" U zinc along the bottom, and 1/8" zinc capping along the circle outer edge. Will a single 1/8" x 1/4" tinned steel rebar placed vertically up the center of the panel be sufficient? I plan to attached the rebar on the front side so the panel can rest flat against the window glass.