We do not know the extent of the technology available in that world, hell most people in the real world do not know the extent of what can be done locally. So we cannot say that anything as far as technology is concerned is impossible. As for the entrance to Golden Saucer, perhaps it was built before Corel was destroyed (another poster already said that it's age is unknown) and if so, the entrance to the Golden Saucer may have been a lot more welcoming than it is as we see it in the game. As for the prison, desert prison is only for people who commit crimes on the Golden Saucer (much like the cells in the Shin-ra building), thus the instant access and relation to chocobo racing in the prison, so why not keep it locally?
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