I took out the Stock SYmphonhy, then detached the front face from the rest of the radio. I was then able to get a decent trace of the shape onto a piece of MDF board. I then measured the exact dimenstions of the radio and got it as close as I could to the shape of the symphony. I used a jig saw to cut the MDF and I cut it 1 1/8 bigger all around so I could sand it to form the exact shape I wanted. Once I got it right I just mounted the head unit into the MDF with some l brackets on the back side. It is such a tight fit in the radio housing it can't move anyway. As far as the Fit, the Avic-z1 is tight but does fit the B5.
Once it was close I tested fitted it in the radio location. The hardest part was cutting out the center where the radio sits, thats a pain to get right. I went through about 3 of them before I was satisfied with the result. I had planned to just match the flat black paint, it looked 7 out of 10.... I wanted more... I read somewhere about the vynal Carbon Fiber, so I went on ebay and bought a 4 foot piece, it is self adhesive and went on the MDF like a charm. It looked 9 out of 10, but the wod trim just above it looked off, so I pulled the piece and matched it with the same carbon fiber hence the photo... It is very clean now, I wold love to have the brushed aluminum trim or piano black to match it but it is too much... I may pull the shifter cover and use the CF on that too.
I also just installed one of these in my buddys A6 2.7t and it looks nice, but not as custom. Metra makes a kit for him, but it is for 2 single din units and you have to fuss with it. I may make him one like mine too.
Thanks for the Complements, if anyone wants help let me know.
James