dl.dropbox.com/u/67202210/lineproject.capx
here is a sample of how to draw lines i made it up quickly around 2 mins :)
there might be some other ways but this way works
you could try improving it
i just added a physics object to test that an object can walk/roll on it
some picutres
<img src="http://dl.dropbox.com/u/67202210/lineproject.png" border="0" /><img src="http://dl.dropbox.com/u/67202210/lineproject2.png" border="0" />
hope i helped :P