I'm currently on the hunt for a Prius. Unfortunately, the budget isn't to big. Found an '07 near me for $3500. It has no options from what I can tell. How easy is it to install OEM options; getting the materials from salvage? Items I would like to add: -Backup camera -Remote start -Fog lights (Read this might be better to do with aftermarket) -Nav system with Aux Are some/any of these just plug-n-play or is there going to be a lot of work involved?