I made a Skylab, complete with RCS tank and thrusters for, well, thrusting. It has MechJeb on it so I can control it after my Apollo-ish command module has disconnected for de-orbit and landing. It has MJP solar panels on the Solar Telescope, and a pair of TKS panels for the deployed main panel. I put two radiators together to try and make something to look like the solar cover.