Hi all,  I have posted Gary tonge's image of architectural world building.  here is one by another artist.   http://phoenix-06.deviantart.com/gallery/#/d1yamj5 This shows in internal heating system.  Enlarge it.

Phoenix 6's Gallery. LOTS OF STUFF   http://phoenix-06.deviantart.com/gallery/

http://phoenix-06.deviantart.com/gallery/271360#/d1h8y6e This talk about a race traveling in "stasis" for a long period of time.

http://phoenix-06.deviantart.com/gallery/#/d3c2g7m Shows how systems can be created also, and provided energy.  Folks show your friends these things, because we need to people to look upward towards the possibilities.

Clicking on this link  will bring up several artists.  Click on the pics to take youself to their websites. That is how I found the Phoenix-06 above. http://creativefan.com/50-mind-blowing-space-artworks/