Behind your rear seat, in the rear deck, say between your rear speakers (remove rear speakers for that matter //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif ). There is usually a fair amount of sheet metal that you can remove. You do not want to remove anything that will weaken the structure of your vehicle, so do some research or find someone local to help you out with it. Then you just recover the rear deck with fabric/carpet and it looks stock. It should give you quite a bit more space then cutting through at the armrest.