Mustang II Member
Joined: May 2010
Location: Iowa City
I see this had a bunch of "views" and no conclusion so I'll post one.
Yes, (this was a year ago) I did install my own stereo head unit (touch screen nav and iPod player).
To get access, take out the 2 screws in the storage unit behind the emergency brake lever (between seats). Everything comes apart from that point on.
Hope this helps someone. I also found a good install guide when I purchased parts from a major online vendor specializing in car stereo head units. The guide was specific to my vehicle and model year.