Anthony, there is really nothing special about doing arches. As you can see, they are made out of plywood, so it's just a matter of attaching the drywall to the them and finishing.
Brian - thanks! As I can see, your setup is not too shabby, either Once I get the seats, I will probably make some acoustic panels for the walls - just like yours. The "boss" struck down the idea of linacoustic, batting, etc... covered with fabric
\"...He who knows how to live can walk abroad without fear of rhinocerous or tiger. He will not be wounded in battle. For in him rhinoceroses can find no place to thrust their horn, tigers can find no place to use their claws, and weapons no place to pierce. Why is this so? Because he has no place for death to enter.\" - Lao Tsu
Yes, the walls ARE painted orange-ish color... Due to poor lighting conditions, the color on the picture is "little" off, though. I was pleasantly surprised when I turned on the rope light in the tray ceiling and the glow matched the walls almost perfectly!
Once I get the seats, I will probably make some acoustic panels for the walls - just like yours. The "boss" struck down the idea of linacoustic, batting, etc... covered with fabric 
