The main unit (at the dashboard) is a Kenwood-someting, single Din. I mainly use my USB-memory to play music from so its perfect. I dont have the GT-model so no Stereo was there from the beginning which made it very easy to fit any unit in there.
I didnt do any of the actual work tho, better left to the pros.
The whole thing cost about 14000SEK ~ 1500EUR.