Answer from cs61c-el (David Tung 16479725) for Question 2
No, because in a way, the 2PN bits are like the index, and the SPN are like the tag bits of a cache.  It just would not be like a normal address if we had the 2PN bits to the left, and the SPN bits to the right, because we would have to reverse them to find the internal addresses within a page.