Point setup.exe at: ftp://huntharo-4.user.msu.edu/pub/cygwin/
There is a setup.ini there that has all the XFree86 packages plus WindowMaker, libPropList, and Openbox. I've tested the packages locally, but I'd like someone to do an install on there system before I post the packages to the mirror network. Oh, I also figured out how to do source packages (using the generic Cygwin build script), so each of these new packages has a source file as well (if you wish to see what was changed to make them compile on Cygwin). Enjoy, Harold