@Daniel OKane, can you explain the issue in more detail? If I take the contours you have here, convert them to 3D Polys (as they are simply lines in a 3D plane right now), ungroup them and then create the site model, I get the site model below.
In the file attached, I can see some extra geometry along the edge of the site model. I've filed a Jira to see why this happens. For now, you can just crop the site model slightly, and it will be invisible.
Site model created.vwx