I think none of us are going to know what the offensive line will look like until after the draft. Because right now, it is still a mess.
The way I would assume, it would be LT is a Draftee/FA, Wood and Levitre are guards, hanggartner is center, and RT is butler. Then incognito (if re-signed) would play back up along with meridith.
But the way people here have talked Levitre played pretty well at LT (i didn't see the last two games, so I am not too sure). So if that happens, we have Levitre at LT, Wood at guard and hangartner at center. As for the other guard position, I would put butler back in there (he played pretty well as a guard) and the RT could be a draftee. And that would be nice, because RT seems to be easier to fill than an LT position.
That all depends on where they place levitre, if wood is healthy, and whatever else happens with who the draft/sign. One thing I am pretty sure about is hangartner is staying at center. I know a lot of people think Wood is going to start center. But I think hangartner was signed specifically for the center position, has done well, he has more experience, and he worked pretty hard for the team overall (played through injuries and didn't miss a game). To me, he is an asset to this team even though he isn't a great player. He is good enough and is reliable. I wouldn't move him.