So yesterday I embarked solo on part 2 of the radio install. I had to get the DAB antenna installed and resolve the issue with Android Auto not working properly through the phone holder. (For our North American friends: DAB is basically HD radio in the rest of the world, but it operates at ~200 MHz rather than existing FM frequencies.)
I read on a Lotus forum that they glued a strip of alu foil down the inside of the A pillar to get a ground plane. That seemed cheap and sensible so I did the same. I folded mine over to make a 4 ply strip for strength.
Now I was able to stick on the glass mount antenna and connect it to the alu foil, then pass the other end of the foil under the washers of some structural bolts I found near the fuse box. With hindsight I should have put the antenna closer to the A pillar but it was stuck tight pretty quickly.
Next I had to recover the other end of the USB cable on my phone holder which Neil had connected to the extension cable under the lower part of the centre console. This was the longest part of the job as I wasted well over an hour trying to find the last screws holding the upper part of the console in place - turns out there are a couple of M6 bolts either side of the VDS screen that were well hidden by some wires in there.
Anyway, once I got that out I was able to recover the phone holder and confirmed everything worked well when plugged directly into the radio.
I then found a more direct and very easy to thread route up into the radio bay to the right of the VDS location. Not even Neil knew about this one! (See white cable in pics below)
After that it was just a matter of reassembling everything (20 minutes when you know how) and then sticking the A pillar trim back in with double sided tape.
Here you can see the location of the phone mount and Android Auto doing it's thing. It all seems to be behaving itself now and you can see that as soon as I put the phone in its holder I got the cards for the route to work and the weather at work. The DAB reception was fine all the way to work (apart from under one bridge where even the Ampera's excellent factory radio drops out).
This is a revelation in sound quality and UI compared to the old Alpine and overall I am very happy with the result.
Now all that remains is for Tesla so send me some more air bag clips (the first attempt failed as only 2 made it through the post - I suggest a better envelope) and to trim a couple of millimetres off the fascia around the radio to get it to sit flush...