I like the thought that you put in this, but I have a couple of question marks.
I don't understand why so many people are talking about Arkin, and claiming that he played this year. He was a healthy scratch every single game this year because the guy just isn't strong enough to play. How does a mid round draft pick NOT get a chance to play on our o-line this year? I think he's another bust and putting him at center would be out of position (unless he played in college, but he came out as a guard).
I like signing Nicks and I think it's a real possibility. A top tier guard or cornerback will be on our team next year, and I believe we will target whichever one we don't sign in free agency through the draft.
I think Kirkpatrick has a chance to fall to us, and if we have to get rid of our 2nd round draft pick just go get him, then I am not interested. There is other top-tier talent available at positions of need (Kuechly, DeCastro, Still and Barron if he drafts wel). I would also be more intersted in Harrison Smith over Martin in the 2nd round. I also don't think Trumaine Johnson will be availabe in the 3rd round.
Also, I see that you moved Ratliff to DE but did not address DT in the draft or in FA. Linebacker depth also is an issue with this scenario.