this picture shows how to lay your 2x4 pieces to mark them for your trusses. the board on the bottom should be cut at 47 inches. line it up with the 23 1/2 inch mark and even with the bottom of the plywood. lay the angled board even with the 1 foot mark, aligning with the 23 1/2 inch mark. you should not change the length of the 47 inch 2x4 just the angles on the end. when everything is lined up make the marks as indicated by the black lines in the picture. these are your saw marks. turn the bottom board over (the straight one) and repeat the process to put an angle on both ends. cut these 2 boards on the lines and use as patterns to mark out 3 47 inch pieces, and 6 of the other piece.