not simply straight. they should go like this:Should the wires be a little more straight?
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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:
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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:
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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:
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