I know this might not be what you were expecting as my next build, but i'm also a space nerd, not just an avgeek, so i guess why not.

Realism

I think i did a pretty good job making everything as realistic as possible; some features include
- real relative orbit times for all the planets and moons
-real relative sizes (except the sun, I'll get to that later)
- adjustable sim speed, with the buttons on the base.

Inaccuracies

-The distances, obviously, are completely wrong, a scale model of this size would barely fit the sun and Mercury in the designer.
-The size of the sun is 5 times smaller than would be to scale, just to make it look neater. If you want a realistic scale, you can just set the suns scale to 5,5,5 with overload.

Gallery

Featuring all the major moons

Pluto is a planet goddamnit

The Earth-moon system

The four gallilean moons

Realistic orbit times and sizes (except the sun, that's 5 times smaller in the model to make it look nice)