I installed a power outlet between two windows in my garage. I want to run power to the outlet from the other side of one of the windows. The trouble is, there are no studs to run wiring through. The windows are installed such that there are no studs under them, and a large header takes up all the space above them (again, no studs to pass through). What can I do to get the wiring around the window? I'll be putting up drywall after this. The ceiling was finished when I purchased the house. Living space above the garage. Thanks!