I have a 2002 XJ8 Vanden Plas. It has, naturally, an out-of-date audio system with text navigation that's virtually useless. It has a cassette player and no place to plug in an iPod. Is it feasible to simply replace the AM/FM, CD player, nav system, cassette with something more modern like AM/FM, satellite radio, CD player, Aux for iPod, etc. that would fit in the same space?