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Ken,
The points you raise are very much like those that would have been discussed hundreds of years ago on iceonearth forums, by people to whom it would have been "obvious" that the Earth (the ground) is flat.
If the flat Earth is not infinite then it must have an edge and then there must be something beyond that edge, even if it's not solid ground. Hence it must be infinite after all. But now we know the Earth's surface is finite AND it does not have an "edge"... And level ground is flat, even though it's curved. What bizarre nonsense!
Same sort of thing with the rest of the world. It may be infinite but need not be. And if it's finite, there is no issue with things beyond the edge because, somewhat like the finite ground under our feet, a finite universe does not need any external boundaries.
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