Module 8b is similar to 8a

Cut the same framing elements and assemble (same dimensions, assemble identically to 8a)

Cut the sheathing exactly the same

When attaching sheathing, place frame on the floor with the narrow stud-gap on the left. Attach OSB with a 6" overhang along the bottom and a 5" overhang off the right edge.

Flip over, fill with insulation and attach plywood such that the bottom edge (side with 6" osb overhang) and inner stud at narrow stud-gap are flush with plywood edges.