I'll be running my wiring on the girts, too. It's all gonna be 12-2 MC as I scored a 1000' spool of it for less than half price on CL. So, no conduit necessary. For the screwing, I have a couple of
DeWalt DW268s. I have DeWalt and Ridgid 18V 1/4" impacts drivers if I wanna go cordless. I'm a firm believer in impacts being used instead of wearing out "regular" drills.
I considered using R-panels for the walls. But, they're about $2.85/ft. taxed/shipped, or $22.80 per 8' panel. I would need about 47 panels for my perimeter wall, totaling $1,071.60. Sure, I could screw them directly to the girts and forgo the stud wall, but the wall wouldn't have the strength of wood and I'd have to take special precautions and extra steps for mounting anything to the wall, especially due to the R-panel's shape. I'll leave the top trim out of the equation for now. 35 sheets of OSB will cost $299.60 out the door.
Regardless of how it's sheathed, I'm going with the stud wall:
Overestimating a few on the studs with 130 at $3.25 out the door comes to $422.27. I figure about $100 (after quick price browsing) for the wood-to-metal screws and about $20 for the framing nails. I'm not yet sure how I'm gonna anchor the floor plate, but between the few options I'm considering, $50 would get me more than enough anchors. I already have a hammerdrill and plenty of bits. So, I'm looking at about a $600 stud wall.
I don't have a price on the primer I was recommended (Farrell-Calhoun #597), nor the additional cost of having it tinted. I'll just estimate it at the cost of what their flat ceiling paint was- $120 per 5 gallon bucket. The spec sheet says it covers 350-400 sq. ft. per gallon (I'm calling it 300) and I need to cover 1,120 sq. ft. (overestimated). Just saying I'll end up needing twice the estimated amount, that's 2,240 sq.ft. divided by 300 sq. ft. of coverage per gallon = 7.47 gallons. 10 gallons would be $240 assuming the same price as their flat ceiling paint that I used on my ceiling and top 4' of the walls.
So, for the stud wall, OSB, and paint, I'm looking at about $1,250 once I factor in the painting materials. For the stud wall and R-panels, I'm looking at $1,700+ the cost of trim. The OSB would be a bit more labor, but would be cheaper and much more convenient for future use and changes. All of these prices are from Home Depot's site and Mueller's R-panel pricing.