As much as I want to disagree with you, I think your board is probably pretty accurate. I have a few comments or constructive criticism.
Zeitler has moved up draft boards with some experts saying he is even in the DeCastro althletic range. Confusing to me how Konz could be rated just under DeCastro yet Zeitler is 30 spots lower??
Your obviously going mostly off need, as OT's who are a better players are ranked lower, yet you have Wagner LB at #14. With Willis/Bowman and Grant, I do not even see ean ILB. Wagner played inside and OLB in a 4-3 in college and more scouts think he would be suited as an ILB over OLB.
With your draft value board all I can say is the Niner need to trade down only a few spots into round 2, pick up another 3rd, then trade up into round two. The value this year is in round 2.
No way Sanu is ranked that high. If the Niners take Sanu over Fleener or Kendall Wright it would be a draft surprise story.