The main thing missing at the moment is cygwin's symlinks aren't working, http://bugs.winehq.org/show_bug.cgi?id=15679
and I couldn't find the file needed to start cygwin's X server.
(And of course the thing that drives me nuts, it only works inside wineconsole. That might be harder to fix.)
With just a little more work, we could do an awesome nesting demo, I bet.