I dunno man... i like what you are trying to do, but i think you are still a little off on the dimensions of the scene, and some of your materials. I took some pics directly from the game. You can see more on the materials in the env, the kind of textures and mainly the spacing and depth. Your env seems really compact.
hmm... the screengrabs were for you to see some of the space shape and layout. For example, i don't think i see in your env that vault ceiling, you have it flat, when in the game it was a half cylinder shape that ends in a tunnel that goes up with the elevator. Then... some of the metal structures that run on the wall are…