I would try getting some coding honestly, it is just a big wall of text with no color or pictures which really zones you out when reading.

You're trying for a jack of all trades--master of none type of build. You get health, but don't have the resistances to back it up. Madreds bloodrazer would destroy you with your current full build. You build ap, but not enough to do significant damage. Pretty much you're building a champ who can't do much in a fight. Nautilus already doesn't do a lot of damage, and trying to force him to do damage with a subpar ap build doesn't work. As it stands your build does meh damage and can't tank magic damage at all.



Your runes are concerning as well. I can understand movement speed quints, but ap/lvl blues and mana regen yellows are not the best choice at all. I'd imagine getting mr/lvl blues and armor yellows would help out your tankiness much better.

In your masteries, you don't even get the upgraded summoner spells. These are crucial to make the most out of your summoner spells. Also, you take points in the reduce tower armor by 10, this is a wasted point better placed elsewhere in your build.

Your guide doesn't have any pictures or nice formatting. You can use this to make it look nicer.
http://www.mobafire.com/league-of-legends/forum/mobafire-support/frequently-asked-questions-read-me-1272