I was asked by a colleague is Revit could make an ellipse beam on an angle. Once he showed me the sketch of what it was supposed to do I told him, "heck yeah". Why was I so confident it could be done? Well, I've seen Marcello make beams follow way crazier forms than an ellipse on an angle!
Using what Marcello has coined "sacrificial elements" the beams were a piece of cake. In fact, they even contain the analytic lines still! Check out the video and download the sample file...
Click here to view the tutorial via Screencast...