love the concept, great looking thread.
only thing i'm thinking is that you're stretching the idea behind sectors A, B, and C.
i wouldn't think you would need an entirely new space for builds made by admins (sector A), especially if you only plan to hire your own admins over time.
you could have one sector be the construction section, one sector be the submitted constructions section, and have two sectors that host two types of games (like sector D).