Retro Futuristic Dome

This is a dome I made for the upcoming 3D film I'm making with my class. We're going for a retro-futuristic city on a moon.

Sorry about the title, can't really be bothered coming up with a better one.

This particular building is a glass dome full of water with a double spiral staircase leading to the observation deck on the roof. The spiral's a bit uneven, and I kinda like it that way. Got told it looked a bit flimsy so I will probably update it with some supports.

Didn't bother lighting/shading/detailing it properly as we don't yet have a shot list so we aren't sure how close we will get to it.

Edit: Was told it was a bit flimsy and it should have supports, so I added some.