Just got done installing a set of Summit's digital gauges and a new Kenwood deck in my Sidekick. I had to fab up a install kit since nobody has a kit to install 2 DIN chassis setups. Check it out.

Not the best pic, but there's more here:
http://smg.photobucket.com/albums/v643/zooki1/CarPics/I had to file the trim opening, file the trim ring for the deck, file the opening in the dash. Then I had to file the small lip on each DIN sleeve where they met so they would lie flat against each other. Basically file everything until it fit. Not a simple procedure, but not too difficult, just time consuming. Here's some other pics of the install, as well as pics of my air intake setup, and my install of a trans cooler behind the radiator.
http://smg.photobucket.com/albums/v643/zooki1/CarPics/