I originally did, and still it's quite viable. Problem with that is that it's almost a waste of an item due to the AS being capped while your shield is up, even without TF. The Sheen/TF damage is pretty decent, but it lacks the ability to keep up with his attack speed. Even starting out, I'm starting to overlook grabbing Sheen at all. If anything I'd put in a Infinity Edge, this way the crits could boost the damage quite a bit, replacing Hextech.

Yes, survivability is an issue here. Hextech helps a little, but it's still not quite the best. Just last game I noticed that it did help regen quite a bit of HP, drained from stray shots and splash damage, but still I'm a bit squishy. The only way to boost him even more, would be to replace much of his AS items, which would severely reduce the objective of this build: to get impale off as fast as possible (AS Max).

Looks nice, Pretty similar to my build, I like it.

The only downside i can see, is the lack of survivability, you won't survive long in teamfights unless you have many other melees that can tank for you.

Also, I suggest you build you'r Sheen into a Trinity Force.

However, I like it. Nice work on it.