You don't have to create an entirely procedurally generated universe either.Regardless,rendering and simulation works with this basic principle.Only things visible in a frame is allocated memory as far as i know.
The only thing that need hand placement in superverse is apocalypse and new genisis, metropolis,war world(something that's definitely needed. A planet weapon with gladiatoral pits and junk)..etc.That's it.Heck! Superman going to source wall would be on heck of a task.It would really make clark look like a spec.
the issue would be adding other cities of dc on earth like gotham,star city..etc.i am of the mind that those don't need in depth execution.
On a side note,Seriously only a hand full of american comics artist/writers have impressed me.Kirby is something else.Nobody comes close.