haha, how did you guess....
there are companies that make headrest replacements with built in dvd players and screens. they are a pretty good color match. price of course depends on the quality you choose. the ps3 might be harder. as you say that you have young kids, having them reach under the seat to load games is probably not going to happen. if you are not worried about underseat space, i have no doubt i can make a folding and articulating mount for the unit. however i will tell you, it wont be cheap and will definitely take some time. it would come up and sit in the middle seat in the rear, and fold down to hide under the seat when not in use. we normally do this for show vehicles, who have sponsors and throw money at their vehicles. i know this is not the case, so the question is, is it something you want to do? or are you ok with just setting the unit under the rear seat? that would definitely be the cheapest way to go.