it's a decent build

I like the build somewhat but I do believe Ninja Tabi or Mercury's Treads work best for Nasus, his slow is already one of the strongest slows in the game and with the Trinity Force you should have enough speed to catch someone in range of the slow but that's just how I think. Also I do love using the Bloodthirster but I rather get that item early on so you can get stacks while farming for your Q and do pretty high damage before late game making the enemy focus you more then it allows you to focus on your other items while pretty much guaranteeing you'll last hit minions ^^

its the best way to arme the nasus it works for me

Well i use juggernaut so i get some tenecity and then go swiftness so i can be faster against all chamions because every champion dosen't have slows or stuns. (for example master yi) and even if they have a slow my slow is longer and better and if anyone of us aren't slowed i can most of the time easily catch up with them. (i always play wiht movment speed boots except when i have champions with momvent speed buffs or playing ad carry.

+1 for effort. Put on "Enable Comment to Vote", so that your guide does not get trollvoted

In my opinion as nasus is my favorite champion. A lot of the setup you have is weird. Like boots of swiftness... :/ you should always get merc treads for maximum ability to chase and not be slowed. plus extra MR always helps. Second should never need to build a bloodthirster. if you sit top and farm your Q for the entire game apart from helping your team. You will do the most damage with just triforce and tanky items. Also have armor Blues and armor quints is a little unnecissary. try going for Move speed quints. or Health per level or anything. But Double armor seems a bit ridiculous. So just some tips from me. since ive played nasus since my first game of league and have over 4k games played.. Just trying to help :) any questions just ask