In the spirit of Kerbal Space Program, Inspired by MauricioDUARTE's modular rockets. 

Allow me to present you, my first big design, the Fully Modular Space Station Version 1.

Everything is a separated piece that can be connected using the two sided screw included. 

This is an eyeballed model with no specific space station parts loaded as references. If you want something specific, let me know.

Connector screw specs: 10mm diameter, 8mm length (please allow margins).

The model includes:

6 way connector, two sided connecting screw

Satellite modules: rotating and non rotating

Science modules,:mid and big (and short and long)

Solar panels normal: small mid big 

Solar panels giant: main panel, extended panel extended panel connector 

Solar panel rotating main body.

Stands: small and mid

Canada arm, hatch door, rotating artifical gravity module

Padding, scale it yourself to fit the rotation you would like. 

Here is my design

ISS mockup, but might be a bit out of scale

Unleash your creativity, make your own space station.