The uprights are constructed of 2 - 2 x 12 treated
segments sandwiched together and bolted with 1/4 inch carriage bolts.
They are then cut to shape according to Payne-Gallwey. The inside
segment is cut 5 1/2 inch longer than the outside segment, it forms a tenon
to keep the upright rigid. There is also a pocket on the inside near
the top for the impact bar.
A series of cuts are made across the top part of the
side rail on the inside to accept the tenon end of the uprights.
These are made with a circular saw set to the depth of one 2 x 12.
The excess will be chiseled out.
The frame with the uprights and impact bar in place.
The diagonal braces are not in place yet, but the frame is nearly complete.