2012 NFL Draft Big Board: Finalizing Top 50 -- no, make that Top 64 By Rob Rang | The Sports Xchange/CBSSports.com http://www.cbssports.com/nfl/draft/...ard-finalizing-the-top-50-no-make-that-top-64 The 2012 NFL Draft is now just days away. A full year of game film study, taking meticulous notes and speaking to scouts culminates in the production of my Top 64 Big Board. For those reading my Big Board for the first time, it is not another mock draft. It is a compilation of the 50 prospects in the 2012 draft class who have earned my highest grades. I don't anticipate Stanford offensive guard David DeCastro getting picked within the top six selections April 26, for example, but the road-grader who has earned comparisons to former All-Pros Steve Wisniewski and Steve Hutchinson certainly ranks among the draft's safest prospects -- and thus a lofty ranking here.