Superb!! Absolutely Magnificent! Theirs many great and big words to describe this amazing piece of art!
The first one that came my mind was, Mind blowing! I must say that the background's details are phenomenal! Your text color is a great touch too, Blends in good.
The colors are well done and give This Fiery Maelstrom in Space great depth!
Great Job Cowboy.
As for the actual GUI Components itself, I would have to say IT would be much better if you added some sort of colors in the menu for better blending.
Same for the Menu Ex: Find Server, Quit Game.
I think you should of edited this and changed the Menu Titles to something more space
Other than the GUI Components (ClientScheme.res and GameMenu.res), A very good and highly detailed GUI.