Assassin build is still the way to go. Bruiser build lacks the oneshot potential compared to assassin one, and Qiyana isn't really built with the bruiser build in mind.

I think jungle Qiyana is quite dead these days. Mid is still probably the strongest choice for her, since you can roam to both sides of the map. Some players take her top sometimes if the matchup is favorable, but overall in top lane bruisers will most of the time abuse her weak early.

Maxing W isn't that beneficial imo as the CD doesn't get any lower, you just get more attack speed with it and Qiyana doesn't auto too much since she mainly just bursts with her abilities. Sure the AS helps but E is more worth to max second imo.

With Qiyana top it's kind of hard right now with the current meta. You mainly want to play around with the brush Q as you can get invisibility and avoid key abilities from enemies via that. I do think Qiyana is superior in mid since she can roam around the map as opposing in top lane your viable options are mid or Teleport to bot lane.

Sorry for the wait, in case you still want it, here it is:

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The account is renamed and I've forgotten to update the link. Right now I'm between accounts but here is one of them: https://euw.op.gg/summoner/userName=defineyourself

The sustain page is fine. You will have a little bit less damage since you are lacking Coup de Grace but having a better early lane phase can lead into you having a better game overall. You can practice with it and then gradually transition into other rune setups if you want to have the extra bit of damage. The sustain page is mainly meant for lanes you get poked in, while Yasuo and Zed mostly want to all in you.

Yeah the build is fine for mid. The build is pretty much the same, you just change it up depending on needs.

I've personally kind of not paid attention to Umbral Glaive, although it's a great item for a roaming champion like Qiyana. I think you still want to go Youmuu's Ghostblade and Duskblade of Draktharr first since you'll gain mobility and more burst, but as 3rd item you can choose based on situation, whether you want Umbral Glaive or Edge of Night. The spellshield is really valuable on a squishy champion like Qiyana, but if enemies tend to ward a lot then Umbral Glaive might make more sense if you aren't threatened by hard CC abilities as much.

That is true, although in some situations you are better off going for the more defensive option. I've personally just always preferred other boots compared to Mobility Boots, but again that is my personal preference.