I'm not done by a longshot, but some of the ideas running through my head is a mercury capsule like crew compartment at the nose, surrounded by all kinds of mechanical workspaces. The large rounded wings like structures are for solid cargo while the circular parts are for liquid and gaseous materials. The engines are inaccessible by the crew, except by spacesuit.
I'm still brainstorming ideas. I pictured this vessel as a control space, an engine, life support and a lot of open space not really dedicated for anything. If it has a shuttle, there are probably two double parked in one of the larger areas of the ship. It is not optimal for any purpose except space for work.