Switching from configure.py to configure-ng.py with PyQt4

[vaxbrat]

I have a PyQt4 module that I had created a couple of years ago which I had set up to use the then current "old" build system with a configure.py and the pyqtconfig python module. With the PyQt4 ebuild switching to use the new system now, I need to figure out how to convert this to the new system. The trouble is that this reference page doesn't go into any depth about how to use the new system:

http://pyqt.sourceforge.net/Docs/PyQt4/build_system.html#module-PyQt4.pyqtconfig

I don't see the configure-ng.py script getting installed anywhere by the ebuilds. Do I have to unpack the ebuild by hand and go raiding for it?