Just my two cents...all things being even, a big technically sound defensive lineman will beat a small technically sound offensive lineman more often than not.
Hudson's best chance in the pros is as a center for a team like the Bears...perhaps because they have had a great deal of success with Olin Kreutz who is virtually the same player as Hudson. Kreutz plays at about 6'2 295 lbs and has been solid enough to make 6 Pro Bowls BUT the Bears know exactly what they have in Kreutz, and they scheme to have a guard help him with the big uglies like Hampton.
Kreutz is a superb technician who will always need that help with that big and experienced NT....because , like I said, a big techinically sound defensive lineman will beat a small technically sound offensive lineman more often than not.
I think Hudson has a chance of going to the Chiefs, Seahawks, Bears, 49ers or Vikings as a 2nd round pick...so that 40-45 spot is just about perfect for his potentail.