The Sector... On the road. Our first tournament

So, the opportunity has finally struck and The Sector is mobilizing. Three members of The Sector are heading to Battlegrounds on April 20, to take part in our first 6th Edition Warhammer 40k tournament.
The Overload is bringing his Necrons. Mo Dakka is fielding Orks, of course. And Brother Captain Marshall is bringing the Ultra-smur.. err marines.
It's a painting challenge now. There are no requirements but I want to see if i can finish by game day! Approx 500 points per week!
This week i need to finish ten warriors, an annihilation barge, and a night scythe, because I'm counting my already finished destroyer lord. I'm about halfway there. Check back again soon for more details!

Double Dragon-Cron

So, I was futzing around with some flyer based builds and I came upon this one. Seems like it would certainly rain down some damage, and with 4 scoring grot units, it could be pretty effective at keeping objectives. Thoughts?

Double Dragon-Cron (1850pts)

Chaos Space Marines (Primary Detachment) Selections:

HQ

• "Billy" - Daemon Prince - Burning Brand of Skalanthrax, Gift of mutation, Level 0, Slaanesh 
  • Wings
  • Power Armour
    
    

Troops

• 10 - Cultists - Autopistol
• 10 - Cultists - Autopistol

Fast Attack

• Heldrake - Baleflamer
  
  
• Heldrake - Baleflamer
  
  

Heavy Support

• Maulerfiend - Magma cutters (Magma Cutter)
  
  
• Maulerfiend - Magma cutters (Magma Cutter)
  
  

Necrons (Allied Detachment) Selections:

HQ

• "Jimmy" - Necron Overlord - Mindshackle Scarabs, Phase Shifter, Sempiternal Weave, Warscythe
  • Royal Court
    
    • Harbinger of Despair - Abyssal Staff (Shroud of Despair)
      
      

Elites

• 5 Deathmarks
  • Night Scythe
    
    
    

Troops

• 5 Necron Warriors
  
  • Night Scythe
  
  
• 5 Necron Warriors
  
  • Night Scythe
  
  

Heavy Support

• Doom Scythe