Skylab 1 was the uncrewed Saturn V flight that launched the space station. The workshop itself was adapted from the Saturn's third stage. As this was an uncrewed flight, there was no need for a command module, service module, lunar module, or launch escape system.
For aerodynamic purposes, a nosecone was needed to cover the blunt end of the third stage. Was there any equipment inside the nosecone, or between it and the third stage?