well that's one thing i was going to add in exchange for the boots, so you could either get the movespeed trinity or madreds depending on your situation really. and i thought about it after i published the build that trinity force also gives movespeed and a little of everything really. but the main focus on this build is getting around quickly and silently killing the enemy team. but the number one reson i didnt pick t-force though is because the cd on the item. by the time you get one attack from it the person is dead and i would still prefer the movespeed from the boots of swiftness to be able to get away more easily. also you dont need the slow or the crit from it since you already have good speed and 98% crit. if you have any further quesstions just let me know

Just had a quick look over your item build, haven't had time to read the guide yet, but why aren't you using yousmuus? (or something). And no trinity force either?