To build 3d editor with OpenGL and Qt which methods/shell I use?

hello all
I want to build simple 3d editor , using OpenGL and Qt.
First what is the correct way to approach such project ? to follow this example :
http://qt.gitorious.org/qt-labs/wolfenqt/
or this is more newer and better way :
http://doc.qt.nokia.com/main-snapsho...es-opengl.html
I will use the latest Qt .
Where to start ?

You can start by determining what functionality your application should have. Then you'll know what technology to use to obtain this functionality.