restoration

OK - so I saw this video. it's on a site devoted to achieving "dreams" and it made me very very curious:

http://www.mydream.tv/dream_category.php?dc=67c6a1e7ce56d3d6fa748ab6d9af3fd7

IMO these people have done something positively extraordinary. If you look at the before-and-after you see what I mean. Has anyone here ever tried anything on this scale, or know someone who has? What kind of time does a full restoration project like this demand? (I'm not even going to ask about money!)