Pino and i were talking about the wall and he figured there might be some problems with the wiring for the lights.
Here's a rendering of a new wooden C channel concept he designed. The Sintra can be spaced apart enough to fit in extension cords. It's made out of 3/4 inch wood and the sintra grooves would be 1/2 inch deep. It would replace the C metal channel, with the exception of the screen sections.
That's what those cuts on top are for, you slide the screen's C channel over it and it gets screwed into the wood.