P
Paper Kosmonaut
When the Apollo Applications Project was initiated, one of the proposed projects was an orbital Workshop, made out of Apollo and Saturn materials. In early 1968 this was the proposed configuration: A "Wet Orbital Workshop", meant to be fully fueled when launched on a spare Saturn 1B and when drained of fuel residues would be modified and used as a.. well, skylab. This is my try to bring that vision off the paper.
This is NASA's sketch:
This is NASA's sketch: