This is so far the only one I have ever posted as a complete build. It may be old but if you click the picture, it will take you to the crafts post.

All space station designs I've made:

Droo small orbital laboratory:

Low Earth/Kerbin orbit station:

Ion Drive Space Station:

Roman Station:

Joel station:

Mars or Duna Space Station /w shuttle and cargo capsules:

H.K.O Space Station (High Kerbin Orbit):

Interplanetary station with landers:

Apollo Station with Interstellar cargo trunk:

Interplanetary station:

Propulsion module:

Here is the link to this one, but it's a module so this doesn't count as a complete craft.
Interplanetary station thrust section
Fuel storage module:

Made one module which was supposed to be connected together to for this module in orbit.
Fuel storage module
Harmony Module:

D.H.O.A.C. Module (Don't even remember what this all means.):

And a station that will show just how capable some of these stations are. This is a screen shot of the Joel Station for clarification.