Re: Here is a photo
Mike Stafford
If it was my shop I would run furring strips on 16" centers from the floor to the roof line screwed to the sole plate and horizontal braces. This could be done after the insulation was sprayed. Doing so would eliminate a lot of the problems with material size and fitting.
I know you said you were going to use surface mounted wiring and receptacles but the space behind the wall material between it and the insulation could be used to run the wiring although code might require it to be in conduit to prevent nails or screws.