My preferred tanky build is basically (as a noct main)
Wriggles (must) Mercs
Then, in whatever combination or even don't get one or WHATEVER
Phage Brutalizer Sightstone (optional, but recommended)
Then, upgrade, in any order
Mallet Ghostblade (I generally prefer this)/Cleaver (If they're building ALL the armor) Ruby Sightstone (optional, but recommended)
Then it's all situational. No, seriously. Hell, skip ghost blade entirely and go straight to randuins if you want. Or, go to Cleaver then on to like stattick shiv. Hell, the only things you need are Brutalizer, Phage, Wriggles and Mercs. Everything else is anything you need.