Questions on Cakkavala in Buddhist Cosmology

I happen to come across the description of Cakkavala as per Buddhist Cosmology from the palikanon website in the link here . After going through the information in that link, I have below questions and thought of posting it here to get an answer from the experts here. 1. Where is Mount Sineru located, and can we see it with our eyes? 2. Does a Cakkavala constitute a galaxy or does it imply our observable universe or something else? 3. Are there finite or infinite number of Cakkavala's? 4. This link here mentions that the Buddha is only born in this Cakkavala, my question is why not in other Cakkavala's? 5. Is the physical universe a part of Cakkavala or is it vice versa? I get that these sort of questions are amongst the imponderables, but curious to know. Waiting to hear from the experts.