Well, I'll make a 2nd data point. I've got a 2002 Maxima and I don't wanna take out the in-dash 6-disc changer. I'm thinking my best bet is to mount it underneath the armrest. I think the only mod I need to do is not use the sled (it doesn't quite fit) The player alone looks like it will fit if I cut a hole in the bottom for the docking connector, serial & RCAs... kinda making my armrest into a docking bay for the unit. Not the best place to be able to see the display or use the controls, but it should suffice.

As far as being vertially mounted goes, if the HD dies, I can see if Fujitsu will replace it, if not, I'll go buy another HD.