help me get running sample Google Web Toolkit GWT app and make another one with a tree control(repost)

the project is to get the "Mail" sample app from GWT SDK samples to compile on my laptop. We can use TeamViewer for this if necessary. Right now the sample app seems stuck in jar hell and does not build. If it will turn out that I don't have the visual designer of some kind already installed, you will also need to install that for me to make sure I can design my own user interfaces later on. The work is fairly urgent, so I plan to pick the first competent bidder and start working immediately.