I'm considering several options for building out a wall in a basement. Unfortunately, due to the way that the stairs leading to the basement are positioned in my house and the spacing I have to build a 30" door (there's going to be another 36" door elsewhere), I don't have much room to put up the typical 2 x 4 stud wall. At most, I have just under 4" to work with and 2 of those inches are already taken up by XPS foam board insulation. To add to the complexity, this wall would likely have to support a large TV (65" or greater).
I've looked at two options and both are worrisome. The first is using metal studs. Unless I misunderstood the measurements, I believe they can come in a 1 5/8" square size. They also provide holes to run wiring through. My concern with this approach is that I'm uncertain of how much weight such studs can hold. I've seen people use 3/4" plywood fasted to the studs with the TV mount fastened to the plywood but I would venture to guess they were much thicker.
Alternatively, I though of using 2x4s but with the wider side facing the wall and running a 1.5" pressure treated beam across the floor. I haven't found much information on such a design, being atypical that it is, and it doesn't provide an easy means of running wire. I'd have to cut out some foam board behind the stud and in some spray foam once the wires are run. I'm also concerned that such an approach would cause the studs to bow out when significant weight has been added to them. Maybe fasten them through the foam board and to the concrete (though I'd hate making unnecessary holes in my foundation)?
Finally, there is the option to cut out slots in the foam board and go with the typical 2x4 framing but with pressure treated wood. My concern with this is that the foam board provides a good vapor barrier and I'd risk not sealing things properly when I go back and spray foam all the holes.
EDIT: I've added a picture for reference purposes: