Hi Everyone ,
Thank you for all your valuable time and suggestions. Sorry it has taken time to reply but have been away from internet for a week!
I had seen the video and thought the wires as you suggest were just put in with gaffer tape!!
Thanks Tony, I see now it is possible to remove the top panel and use the ceiling routes around the roof lights. I will go this way if the run is less than 4metres, the max for data runs.
I am still going to investigate further the shortest route with some small drill holes my original thoughts of trunking or engine bay access, and will see if later boats have the same access as Salty's . I will then make the final decision.
It may be 2 or 3 weeks before i have it sorted, but will let you know how i got on.
Regards
Nick
Ruby Tiger