I would usually try and avoid Alcast for PvP builds if possible. He releases builds for all classes and setups and so while some of them might be good they aren't always the best nor adhere to the everchanging meta.

Unfortunately, DW is not very good for PvP, ideally it looks a lot better but it just doesn't add up to 2H. For stamblade, 2H/Bow is the strongest setup and has been for as long as I can remember. Eternal Hunt is not a bad set per se, however there are much better sets out there for stamina nightblade. Hundings and New Moon will give you a strong stat sheet but you will be very disappointed when you bring that into PvP because of how the meta is right now. You will encounter these very cheese tank builds that are able to burst you down. On top of that, nightblade burst is super predictable and is easily dodgeable, and so when it is dodged your combo is completely ruined and you have to start over. I would recommend running sets that will give you more reliable damage to combat lag and roll dodges from other players.

Of course this is just the surface of what goes into a good build. For stamina nightblade, I would highly recommend checking out Grimhallow on Youtube. He makes very in depth build videos and is the guy to go to for your nightblade needs.

I actually like alcast builds if you are new. You learn to adjust for your style of play and chosen game modes.

Unless you are zerging or ganking dw bow will be a huge challenge to you I think.

If you go eternal hunt (awesome for solo kite style) you need damage everywhere else. NMA /briarheart infused jewelry and a master's or maelstrom bow and you may still struggle to take people down.

I run eternal hunt with venomous smite, double dot poisons, selenes/mephala, and blackrose prison bow for OW. It's a 2h bow set up you could make dw if you really preferred and maybe use sheer venom instead of smite.