qyoto is the qt/kde bindings for mono/C#. It would be great if we could get them into the tree. I have created an ebuild which you might be interested in using as a starting point. I believe that the mono side of it is being handled correctly. http://github.com/alistair/ironruby-overlay/blob/master/kde-base/qyoto/qyoto-4.4.5.ebuild
This is included in kdebindings-csharp... :)