Damn it where's 7th gear when you need it?!
A very good instalation guide is on the navplu.us website, it explains how to do a single to double din conversion with the view of fitting an RNS-e unit but its the same process you'll need to follow. The guide is found by going into the RNS-e forum, the top sticky is "quick links" if I remember right & somewhere down the bottom of the page in the B6 section is the guide.
A4 3.0 Quattro Sport - Gone & missed everyday!
Current road going missile.....
........Smart Roadster - arguably the most fun you can have in a car without using lube!!