here's a better Nova build:
Griffon - 5/5 rbf
2skill 20 fcr amulet
Vipermagi - 5/5 rbf
infinity
frostburn
arach
soj
fcr ring +5 str, high mana
mana boots - 30/10, 5% increase max mana, 10% mana regen
somewhere on amulet, ring, or boots you should try to max poison res and plr. with nova build you don't need block or other res, just poison res and plr.
swap: es/ca/ts cta staff
Merc: eth cure, eth coh, and eth insight
that's a strictly worse build
What DMG I can expect from this built, seems to be around 5K?
display damage is meaningless. you could have 6k displayed dmg and still deal way less dmg than a build with 3k
D2:R