Still needs a lot of details but I had fun with it so far.
Nice design.
Maybe you can add a little light by activating Environment Lighting in the World tab by 0.3 for the energy to replace the dark area. But it’s really nice though.
Thank you both. I’m planning to have a ship fly by and have it’s lights panning across the gate. Eventually. I’m still making the the ship.
I’m looking forward for what you’ll render… 
Well, I used it in a short video. This is a very simple piece but it was fun.