2000 pts Daemonkin w Belakor's Help

So I don't even have the Daemonkin Codex yet, but I'm thinking of how I'd want to play with that...is this possible with that book, and if so, is this stupid?

2 D-axe Bloodthirsters

2x8 Bloodletters

1x12, 1x16Flesh Hounds


Belakor

10 Cultists

Dreadclaw

3 Nurgle Obliterators

Void Shield Generator w 3 Shields

The idea being the Void Shields help protect the Gliding Thirsters, as does a Swooping (or maybe Gliding, why the heck not?!) Belakor who does Shrouding and probably invisibility on someone. The 12 Hounds provide cover for the 16, which improves to 3+ cover due to Shrouding. I'm not sure how 'competitive' it is, but it sounds pretty scary to me!

Incidentally, what base size is the new Thirster on? Is it Knight sized now?
Thanks!