I've been looking at how to use eclipse with the setup that Rob has made now.

If "the developer" is only going to change Java code, then it can be downloaded as before from inside Eclipse. This is discouraged as we should be versatile 😉 so:

"The developer" should check out all the files on the google code site using something like tortoisse. Next step is to open up Eclipse in a "random" empty workspace, and then create a new project, selecting the using the "create from existing source" option browse to the folder of the java code.