Seems you find the trick :)
You rocks! Indeed that is the task ! :)
You are a genius! :)
But how do you make that ?
With the sandbox or with an another plugin?
You use the 3ds format?
I am curious of that :)
What is your process?

first:
curves lines arrive in Sketchup as a Component and when you explode the component curves will become separated

second : what function use for the Skin, Buble etc...