Pg 9 - Mounting the projector and wiring, pg 2
I removed the ceiling mount bracket and drilled a hole through the ceiling and into the attic above. I then ran a standard 14-gauge extension cord up through the hole and down the wall to a point behind the location of the future equipment rack. The projector’s cord plugs into the extension and everything is tucked away above the bracket. I’d like to say that I love it when a plan comes together, but there was no plan. I’m making this up as I go along (and getting lucky).
Here is the equipment end. I’ve left out the picture of all the "exploratory" holes I had to drill the find the darn cord. Barely visible here are the (mostly) healed incisions. The cord will plug into an outlet strip and eventually into a Richard Gray Power Company conditioner. 
This picture shows the now black felt wrapped cable bundle from the projector to (again) a location behind the equipment rack. The rear surrounds are now wired, and the flat screen monitor - for HTPC and s-video OSD of the pre/pro - is also visible. (I’ll devote a page or two to the construction of the HTPC.)
If you own a Sony VPL-HS20, you might notice some extra equipment in this picture. As I mentioned at the beginning of this adventure, using a micro-perforated screen (to allow the center speaker to be behind the screen) causes moire with fixed pixel projectors. The only fix I know of is the IMX Image Processor, a specialized lens that removes screendoor. However, the housing did not allow the IMX to attach to the PJ. I located a company in the UK (!) to custom-make an extension tube, barely visible just behind the IMX.
I now have basic picture and sound. In fact, it looks and sounds so good that work has been halted while I enjoy the fruits of my labors.