Tape plan page #2 to work top. Cover with wax paper.
Draw a 90º right angle on a piece of paper; place pins on line.
Place 1/16 ply strips against pins & glue the two pieces with thin CA The photo shows BF3; make 4 of these. Remember we are making two booms.
Trim off edge on all 4 pieces.
Trim off remaining over-lapping ply on corners & draw 1/4" x 1/4" notch in corners. NOTE: I used 3/8 x 3/8 only because I have a surplus of the stuff. Also, mark the center line of the formers on the front side rails top & bottom.
All formers made.