I like this! It would provide a consistent theme on that side of the park.
My only qualm would be with Mission Space. That pavilion seriously needs another ride element inside it.
IDK how feasible, or even possible, this is, but just imagine the structure and facade around the simulators was taken out, a new structure built over the simulators, and two omnimover (or PPF style) attractions installed (one for Orange and one for Green). The current exits from the simulator rooms are perfectly set up for this, and both omnimovers would weave in and out of each other's paths with some shared show scenes and exclusive scenes for each track. Both attractions would exit into a main postshow space like the Living Seas with rotating exhibits on current space travel advances. I honestly should draw an example to explain it more, but it would be a major step above having just simulators.
Even if that's not 100% feasable, I'd love to see more added to Mission Space to make every ride on that side of the park a strong offering.