Lets wait and see what we do in free agency. If we address LT in free agency then the only tackle we'll need to draft will be a RT and that can be drafted after the 1st round.
After reviewing some games of Zack Martin I think he may be our guy and I think he can play LT and if not he can move inside to LG. The fact that he has less than ideal arm length will probably drop him somewhere around where we pick. 32.25" arm length is comparable to Robert Gallery (also 32.25") and Chris Williams (32.75"). Gallery was pretty much considered a bust until they moved him inside to LG. Chris Williams' career has been filled with a lot of injuries.