Next, we are creating the "rim joists." Two of these are used for the module w/o the notch, and one is used for the module with the notch.

Gather all three of your 5' - 11 1/4" boards together. Mark all three of them as you see in the image on the left.

ADD PICTURES SHOWING PROPER PROCEDURE FOR LAYOUT WITH A SPEED SQUARE AND TAPE MEASURE.

Put one of these back with the stack of pieces for the notched module. Keep the other two available for the next step.