Hello there 
First of all i like the idea , I loved Stargate movie, It’s a nice scene to work on .
It is WiP but what i notice the most is floor being too metalic , would look better in my opinion if it was more stoneish.
About the lighting i have a feeling like it is not soft enough , too much bloom and saturation for my taste and there could be more light shafts coming out of the holes.
Other than that good job on the meshes and the textures