Screw into studs, not drywall anchors, for something heavy that will be above your head while you sleep!
If you're worried about shorting the circuit with your screw, turn the breaker off first.
Measure voltage between hot, neutral and ground, and make sure its 0. Then measure resistance, and write down what you find.
Then try to make sure with the stud finder that you're screwing directly into the middle of a stud. It is then, very very unlikely you will hit the wire. Especially 4-5 feet above the floor!
Once the screw is in, measure resistance again and compare to what you wrote.
If you see a significant change in resistance (>2%) then you might have hit the wire with your screw, and should take steps to repair from it. You could disconnect the outlet in the overhead's junction box, or you could cut open drywall and replace the wire.
But more than likely you will measure no change in resistance, and can turn the breaker back on with confidence that you're OK.
I'd build the wall in such a way that the entire thing acts as a post:
- Use 3-1/2" or 4" construction screws instead of nails at all joints
- Use construction adhesive at all joints
- Use screws and adhesive to mount the bottom plate to the floor framing
This configuration will be as stiff and strong as it would be if you used occasional steel bracing. Any right angles or other wall connections will enhance strength.
Best Answer
You could solder on some brass "D" rings and wire it similar to the way you would hang a picture. An experienced metal worker would be able to attach those without much of an issue.
The process should be reversible, however, it may have a negative effect on the value. I would do more research to see what the value was before making any modifications to it.