turbo- You've seen my bezel, but the one I used with your method was for a 97' Talon TSI with an 8inch t/s monitor which I managed to sqeeze in pretty good. It came out like this, but I can't find the images of it painted. Cig. lighter was relocated to the side of that panel where the monitor was installed.
And a BMW 530 with a 7in Xenarc700TS. I used cardboard to support the back, then used the Urethane Bumper kit to fill in the rest. I don't have pics of the processes...but here is the result!
NOTE: All that is there is the monitor, two pieces of thick cardboard that was hotglued to the monitor and then filled with the same stuff. two layers of cardboard was used on the botton half and then glued the wood trim pieces into place to match the rest of the dash!