Hate the tank meta as an adc try this...

Good build for a mid game glass canon tank killer. Late game will be an issue if you don't build more crit thou. Add Still glasscanon but keeps you more viable for lategame.

I can't wait for the New Guinsoo where Vayne will get her W off every two AAs instead of 3

you can even build on some adc's. while it is not ideal if someone else is building it, i am a fan of building it on blue ez and sivir.