I would like to have a revolve fill in the bottom half but not intersect with the overhanging piece. I'm not sure how to revolve with respect to an existing curve though.
I'm not sure this answers your question, since it looks like you were already there. Perhaps your question arose because there were multiple bodies remaining in the model. If the picture below is what you are after, there are two ways you can get there. You could combine all of the bodies that you already have, but I think you want to retain the split. So the way I've modeled below is to create a surface at the top of the revolve that you've just done, and cut away all of the solid bodies below that except your new revolve. I hope this helps, and good luck.
Don't merge the revolve of 180 degrees in your image that you posted. Do a extruded cut matching the profile or end faces of the grooved egg shaped item removing the portion of the revolve that would consume part of the grooves. Then combine the 2 bodies together.
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