Module 9b is basically the same thing

Build the framing exactly the same and cut the sheathing identically, but attach to opposite sides.

So essentially, after the framing is built and before the exterior sheathing (osb) goes on, place the assembled frame on the table/ground with the narrow stud-gap on the left instead of right and the window on the bottom.

Attach sheathing as in step 4 and continue following all directions.