The area above the sliders will be used for displaying the planet information (amount of population, planet terrain type, amount of infrastructure built, etc). The area below sliders will be the construction item that the planet is building. Note the multiple planets per star system, so many that there's a scrollbar required to be able to view all of them. This won't be normal, I recommend 0-6 planets for a normal game. But the functionality is there in case people want to play with more than 6 planets per system.
Tomorrow's agenda: Fix the slider's arrow buttons, add the planet info and labels in display, and add end of turn processing.