When someone ask if something can be done in Revit I assume he is looking for a tool in Revit can do the task more easily than by hand.
So I told it has to be done manually, meaning draw the flatten layout of the cone the way you would do in AutoCAD, or by hand, using the height, pitch, and diameter of the cone. Since it can be done that way even by hand, saying Revit can do it is a moot point.
@Anonymous After you are done figuring out the flatten shape of the cone, draw it using a Filled Region with a model pattern matching the sheet metal dimensions so that you can see how many sheets you will need.
