AutoCAD Inventor :: How To Make Cables For Cable Stayed Bridge

It is a while ago since I used Inventor, so i'm now just practising a bit to get the hang of it.

As a start a cable stayed bridge looked fun. So I made the towers and the roaddeck. But now comes the tricky part, and that are the cables themselves. When I started I just thought I could use the 3D sketsh feature. But as it turns out, that feature is not available in the Assembley environment. I could just make the cables as a Part and then insert them in the assembley, but that is to much work. As you can see from the pictures below the holes I made in the towers to accomodate the cables do not line up with the edge of the roaddeck on which I want to secure them. So the cables make to much angles for me to make the as a part. And besides that, I just think it could be done more easily. 

Below you can see the images I made of the bridge so far. The first one is an overall image, the second one shows the tower with the holes (if the holes won't work, I can always make something else), and the third image shows the area on which the cables will be attached to the roaddeck.

Can this be done in the Assembley environment? 

Note: I planned this to be a cable stayed bridge, not a suspension bridge. But tips to make this into a susension bridge are welcome as well.

For the record: I'm using Inventor 2012