I'm planning how I might cover the horizontal stabilator of my Gazaile build. The plans call for 1.2mm okoume plywood, although 1mm birch can be substituted. However, the birch is only sold in 4'x4' or 5'x'5 pieces, and I need a full 8' piece to cover the stabilator. Is it structurally safe to scarf two 4'x4' pieces of 1mm birch together, with maybe a reinforcing strip on the interior? How are thin pieces of plywood joined end-to-end?