Looking fantastic, my friend @lis!
Regarding the small cable, what I do is this:
I first microdrill a hole at the fuselage with my mini drills, where the cable is supposed to go in.
I use stretched sprue for the cable. I cut a part slightly longer than required.
I then carefully put a very small amount of styrene glue in the hole.
Then I insert the stretched sprue cable and let it rest at the main cable.
Then, I also put a tiny amount of glue at the two cables touching point and let it cure.
You may very well use not stretched sprue, but your cable of preference, but if you use stretched sprue at both cables, you cn use normal styrene glue allover and, moreover, the next day, you can apply hot air (not too much) with a hairdryer and the cables will nicely tight!