Thanks guys - although you are talking at cross purposes!
- ARGHH! - which one!?
Teapot-7 - I agree - this IS the direction I am going in, but with additional scale and an extension of plot and a foreground character of which I will post my modeling progress later…
Basically - A non [deep] space fairing civilisation (not unlike our own) has been rescued from their dying world by a higher intelligence; a race of (familiar in our folklore) ancient beings who can travel at speeds beyond light. These beings have intervened, nurtured, and witnessed the events of many civilisations over many tens of thousands of years, indeed, they may even have seeded many of them. Despite their technology and speed, it would still take many years to reach inhabitable planets, and suitable habitats would naturally be constructed for the duration of the trip to transport the civilisations, their crops, plants and other species from their world.
In the scene I am going to portray (based on the existing concept), the rescued civilisation will either be arriving at their new home world, or boarding the vast ‘ark’ mothershp on the beginning of their long trip. The world in either case will be seen through the open end of the cylinder.
I just cant quite decide which plot to take - it doesn’t effect the image too much other than whether the planet looks like it’s in decay. or a healthy virgin globe! 
If there is time, and I am aloud to do both !?!? - I will also have a go at the orbiting ship and city 