Fishing wire for 2nd AC in 25' FB

[SailAS]

Well I finally bit the bullet and got a second AC to install in my 2007 25 FB Safari SE. Since it only had 30A service coming from the factory they really did not plan on 120V wiring to the Front Roof Vent ( although there is a thimbled hole in an adjacent rib presumably for 12v wiring for a Fantastic Fan but there is no wire there of any kind).

I've already installed a second AC Breaker Panel and changed out the power entry for a 50 Amp unit ( see attached photos) & wired the 2nd panel with 10/3 like the factory panel (AKA each panel has it's own dedicated 10 AWG conductors to the 50 Amp inlet) but I am "challenged by the branch wiring.

Although I have fished a messenger from the new AC Circuit Breaker panel to the area behind the Shower and even up to the top of the Shower enclosure ( That's where the power roof vent is - see picture) but how do I get from there to the other side of the adjacent horizontal rib so I can use the "factory" available thimbled hole to bring 120V to the Air Conditioner.

So far I have been unable to find any "thru-hole" in that rib ( there is a good Video from the Mother Ship about where are the wiring runs are).

Anybody got any thoughts?????

Thanks , D

[SailAS]

Since no one replied, I went ahead and drilled a new access hole thru a roof cross member big enough for the 115v wire to go thru . Airstream has access hole in this member but they are well out towards the sides and next to impossible to fish a messenger thru. The roof cavity was accessed via the Shower power vent There is plenty of space between the fiberglass shower and the wall for the wiring.