Am I in way over my head here?
No, it's actually not that difficult, assuming you understand Web Services and how to leverage an API. Send a friend request to Ben - community.kaseya.com/.../default.aspx and he can get you the info.
Is it a difficult thing to do?
Great, I will do this.
Would it be possible to create a link within the VSA to an external application such as GESTEC ?