Markymark59, sorry just saw your post.
Regarding the DAB aerial, I believe that the receiver is now located somewhere in the dashboard. Stereo reception does not seem to have suffered due to the relocation.
I had the roof up at the weekend for the first time proper. I did notice the wiring from the solar panel appeared to be running inside, right at the rear of the pop top so guess its all rooted through the inside of the van.