Thanks for your help Don.
I've noted your advice !
Yes I'm aware that the rated current carrying capacity is different for automotive and I'm following the cable manufacturers specs in relation to cable length runs and protective fusing.
I intend to post some pics and info on my mods. I have been successful in removing a lot of the interior trim and now know where the trims clips and mounting points are concealed. I have not yet broken a trim clip or damaged any of the plastics so its going well so far....
Cheers !