Saturn,
I had Da-Lite custom-mask the screen to my own specs -- Like you, I did not bother to do any "tweaks" myself. Mine is the 8'x10' Model C w/CSR, custom-masked down to a 58"x104" (or 120"-diagonal 16:9) viewing area. It has a 8" black-masked border on either side, a 10" black border below, and a 28" black "drop" above the viewing area. Of couse, the masking was carried out with a 100% professional care and quality.
Da-Lite will be glad to custom-mask the Model C or any other screen exactly to your specs, with essentially no cost to you! -- mine costed ~$600 including shipping, about the same price as a plain-vanilla 8'x10' screen (with only a ~2" black border each side). Although you will buy their screen via a dealer, I suggest you directly contact Da-Lite first, and discuss about custom-masking.
