Curtain wall mullions problem

[ebow3d707219]

I am pretty new to Revit, though well experienced in 3d archiviz.
I've been spending quite a lot of time now trying just to get this basic curtain wall done. I cannot find any way to clean up the horizontal mullions here. Does anyone have any solution, please. I would much appreciate it.

[patricks]

You need to use a proper corner mullion family, not a rectangular mullion rotated 45 degrees.

[ebow3d707219]

You need to use a proper corner mullion family, not a rectangular mullion rotated 45 degrees.
Yes, but how do I do an angular mullion with the built in corner mullion families?

[patricks]

Perhaps have a look at this post: http://forums.augi.com/showthread.php?t=102735

There are others if you search for "create corner mullion"