I read through the thread and it looked like really hard work with the trial and error, though it seems a lot of it wasn't required. If it ends up being only the module and the antenna cabling then I'd be taking it on for sure so am keen on his answer to your question there about what would actually be needed as a 'kit' to get it done.
No nav. That aftermarket one looks ok, I'd seen it before and considered but haven't yet bothered to take the plunge.

