This guy had the stock head unit/climate controls moved to where the ashtray is and put in an aftermarket head unit and DVD/NAV where the head unit normally is. This is definitely a clean looking install.
http://g35driver.com/forums/showflat.php?Cat=&Board=16&Number=79858&page=0&view=collapsed&sb=5&part=
http://g35driver.com/forums/showflat.php?Cat=&Board=16&Number=79858&page=0&view=collapsed&sb=5&part=