not simply straight. they should go like this:Should the wires be a little more straight?
not exactly like that but you get the idea.
blue parts are among the hydraulics cylinders, held together with whatever you find. green parts going their separate ways from a common point.
and yes they should be a bit thicker. but i think once you straighten them, it won't matter because the movie effect will be already there. check the movie reference posted a while ago:
Screenshot of the hand & part of the forearm from the movie.
here is another one, with more of their length going deeper to the elbow side:
note how they are thicker at the base and thinner when they start going their separate ways. there is a distinct thickness division. that's because there is something like this in that zone: