Answer from cs61c-ck (Allen Lee 16583554) for Question 2
I can't seem to find the section in the book about multilevel paging...
But I think the answer is no, because the super page table is supposed to be a page table for page tables in a multilevel page table implementation.  We need the super page to cover a large range of pages, which is why we borrow the most significant digits to find the second level page.  If we moved the SPN to the right of the 2PN, we lose that range.