Lucida Cable Routes

[Sathhin]

Hey everyone :) I hope this is the right place to post this, first off I'm posting this on a family member's behalf. They want me to fit an audio system for their Toyota Lucida.

Last time I helped out fitting an electric lock system, I remember that cable runs were really difficult from the engine compartment to the car interior. This was for two 1 mm cables so I was able to squeeze them through. For the amp power I'm looking to run a 12mm cable, so I can't use the previous routes.

From what I remember any cables running through to the car interior are sealed and a tight fit. Is there a cable run that anyone is aware of, so that I can avoid drilling through? Thanks again for any help :)