You have a lot of points invested in Res Orbs for Warrior squads. I wouldn't bother with them, as most of the time your Warriors will be within those Ghost Arks and safe from harm. Even after the Arks are destroyed, most enemies probably have enough firepower to remove enough of the squad for it to be a real threat, even with 4+ WBB. I'd give the Overlord the "classic" Warscythe, Weave & Mindshackle Scarabs, so he's a pretty good deterrent for most melee threats. The other Lord I'd let go, he's probably not going to pull his weight. With those points you could fit in an Annihilation Barge, for example.
There's a problem with the Cryptek joining the Deathmarks. He cannot Deep Strike, so the squad cannot do so either. Also adding anti-tank to Deathmarks seems like a waste, as their preferred targets vary so much.
Add the Cryptek to a Warrior squad instead, they work great together
. The weapons of the Warriors, Ghost Ark and Cryptek all have similar strength and can glace vehicles.
All in all a pretty solid list. I've had pretty good success with Spyders' Fabricator Claws in some games, while in others they don't get to do anything
. But if they're keeping my vehicles moving/shooting just one turn longer than otherwise, I think they're worth it.