Welcome to Librarium Online!
A few points;
How are you getting a 2 plus to arrive turn 2? If your using lictors and Tyrants together, lictors have to be around from the start of the turn to get the bonus. So your looking at a 3+ from the start.
What do you mean by combining shadow and scream? Shadow only affects pychic tests unfortuantly, so you arnt going to get a lot of damage from scream. Assuming your against guardsmen, the best result is only 5 wounds
Why would ignoring cover be important, sure you can block LOS with the pod, but theyll always be a tank that can see it from a different angle.
As for the idea of the army, im not convinced. With a 3+ to arrive your army will arrive a bit peacemeal and could get picked off at will. However i do intend to use a large deep striking contingent with the rest of my force, to form a sort of ariel pincer move.
Your friendly neighbourhood gargantuan creature