Here we go:
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This is what Point Inception used to look like. It was intended to be replicatable so I could have one around every planet...
When that purpose expired though, I ended up changing a lot, including adding a dock for the Tsar and much better fuel capacity (those orange tanks weren't nearly enough)
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I had to change the station quite a bit to fit what i needed it for. You can actually still see it has the same hub as before though (although that was its second hub even).
Your progress is actually really impressive. If you're using it as a staging ground though, remember that it's never a bad thing to get rid of a part if it isn't serving your needs. I actually just did that recently as well:
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The old docking section wasn't quite working for me, so I replaced it with a newer version.
Anyway, just keep going, you'll figure out what you need. Also, if you're looking for inspiration, maybe try tackling one of the challenges. They really help.