This was something I wanted for terraining and thought it would be useful for others - a biodome you could see inside of but which wasn't full of water or gas or whatever. I took the water biodome and removed the water, then took the struts from two of the biodome varients to give some variety.
Please feel free to use in your maps. A credit is always nice :)
I may make some more variations including one with no floor if people would like.