Unfortunatly, I'm no help with the Eclipse part, I use the JDE.
However, for the web service call, I'm not sure that you add a web reference. Using ksoap and a web reference seems redundant. Keep in mind, I'm used to using Visual Studio.
ksoap wraps the call to the web service rather than the web reference.
The article that you referenced has a good example in the download file of creating the call to the web service. I've used that to create my web service calls and it works beautifully.