Alright, I will go with you guys there.
Using smotherman (2 versions) and my best judgement. These ships need smotherman stats, necron specific smotherman weapons, extra points (probably 10-20 per ship) for inertialess drive, and smotherman specific shield points for reactive hulls.
Cairn: 525pts
Reaper: 385pts
Scythe: 315pts
Khopesh: 220pts
Shroud: 200pts
Cartouche: 155pts
Jackal: 50pts
Dirge: 45pts
There it is. My best attempt at it. If you want me to explain them, I can but it will take a while.