Alrighty, well. I'm assuming that little rectangle with a red dot above it is a door in your scene. In which case, there needs to be some more stuff to give the world a sense of scale. Just looking at it, I'm not sure how long or tall that room is in comparison to a person.
I did a few image searches for warehouses and basketball gyms. Albeit, neither of these are what you want, but they could give you a place to start. (I kinda forgot that this was supposed to be
Olympic air rifle range, so you'll want something a lot more modern and spiffy than this stuff, but you can use it so far as what sort of structural pieces would go where, just make them look different).
http://www.thesportshouse.net/assets/images/Gym.JPG
I did a quick 3d sketch as well, only maybe 10 minutes, and forgot again that we're talking 2012 Olympics, but you can get some ideas perhaps. I'll see if I can come up with something more interesting in a bit.
Of course, a real modern Olympic stadium would be a whole lot more spiffy. More than likely with a bunch of smooth surfaces and nice round curves...