Boards needed:
G -- Back inner frame side (2" by 6" by 60-1/2")B -- Back legs (2" by 8" by 57-1/4")
J -- Rear support (2" by 4" by 76-1/2")
Place the back inner frame side (G) horizontally on the floor in front of you, then position the two back legs (B) on each side, flush with the top of G. Attach G to the two B's by "toeing in" decking screws (inserting them at a diagonal) from the top of G. Don't worry if it seems wobbly at this point--boards added later will provide support.
Position the rear support (J) across the two legs, 35 inches down from G, as shown in the diagram. It should be flush with the outer edge of the right leg and extend 1 1/2 inches past the outer edge of the left leg.
Secure it on each end with a 2 1/2-inch decking screw (it will later be bolted on). Square the frame by measuring diagonally from corner to corner, adjusting until the measurements are equal. Hold in place with a second 2 1/2-inch decking screw on each end.
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