You can trim out the orig. faceplate to fit a double din with enough time, Ive seen some guys fiberglass the bottom edge to give it a better finished look. Alot of the whole install is the install of the unit and how it fits to the bezzle and then mounting it in the dash to keep it level and make it fit right. Thats where the time is and with enough time you can make yours work just fine!
Go to wal-mart, buy a set of regular corner brackets in the house department. You might have to modify them slightly, but they work very well. Then figure out what you should cut out and modify it to work. Not too hard, more time consuming than anything.