Star Trek is about ... space ships... and space stations.
Yes, its about characters, and yes its about stories and drama, and yes, its about offering parables to humanity... and i guess if you are the studio its about money.
But for me, at some point its about space ships! And Space ships need space stations!
I've been fortunate to obtain, yes, a few space stations. Click a link to get the details...
- Also the DS9 Wormhole Relay Station There's a great Youtube video showing an intereview with DeForest Kelly that features this model and how it was filmed. Check out at about 5:30 into the interview.
Deep Space 9 - Protoype Model 
Deep Space 9 
Deep Space 9 - Weapons Upgrades 
Starfleet Drydock from The Motion Picture