Create Sheet Metal Dome

Hi there. I'm trying to create a sheet metal dome, which is the outer part shown here:

How should I go about making this into a sheet metal part? I've been told to avoid "Convert to Sheet Metal" and "Insert Bends" (just tips for good practice), but I'm not very familiar with SolidWorks yet and I don't know how to do a revolution using the Sheet Metal parts.

So, I've run into the problem of using "Convert to Sheet Metal", but only getting a little bit of it to convert:

So any help would be greatly appreciated.

Thanks!

Sam Dale

(Also note that "Combustion Topper.SLDPRT" is trying to do a revolution with sheet metal tools and "Combustion Topper 2.SLDPRT" is trying to create a solid feature that I then convert to sheet metal).

SolidworksSheet Metal