Nice guide, but:

Why use Marrowwalks? For PvP you dont need summons, so +skills is useless, you dont aim for max block, so dex is useless. Alternatively, Treks give fhr, str, vit and poison resi, so you wont have to change to venom ward when fighting other nova necs for example.

Also, triple resi boots, other stat boots and various other alternatives would be a better choice imo, as you suggested in the first variation.

Also, it lacks in some senses, for example, you would not be able to make the first build on ladder due to no valk, etc, however that is a minor thing, I presume, since you provided other build variations.

You rely too much on realm dupes, which:
1) do not exist on all realms
2) are banned from many legit duels

Besides those things, its a nice guide.