yes you are correct the design in the book is wrong as you have proven with autoCAD. DO NOT NOTCH AND BEND FF3! Make FF3 in two independant sections weld the short upper section to FF4 then add the lower section while in the jig,when you make your front frame jig add two 90' uprights either side of the lower section of FF3 and clamp these SQUARE TO THE BASE OF THE JIG.
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