I have five pieces of plywood left over from another project. Every piece is cut clean and square, want to minimize cutting and maximize the number of nest boxes (or holes) I can get from it. Would like to put slanted top(s) on to keep birds from sitting on it. Makes my head hurt. Anybody care to do my engineering work for me? 1 piece 2'x4' 2 pieces 2'x2' 2 pieces 1'x2'