Val, your worldship is fine. That is a loose categorization based on size for the Neo-Standard. You don't have to make it look like a planetoid if you don't want to. There is only some many things you can do with a sphere anyway.
I like the way you put the smaller ship in view on the Worldships pic. Gives it a sense of scale. What ship is that though? I couldn't find it in any of the other images.
Geoschmo