Hi Dave
The guys made some mounts up, I assume out of MDF - I didn't see what they did but plan to take a door cover off at the weekend and have a look. If you want to - you could use my mounts as templates.
The wiring etc is a piece of p**s.
You're not far away I think (I'm in Brackley) - happy to show you next time you're up this way - and I'll take some pics at the weekend.
Cheers
Rod