I've never done a stadium show before and I came on here expecting some good advice, not to be talked to like I'm handicapped.
The reason we question is, because from your posts it sounds like you're in over your head. Stadium sound varies wildly from venue to venue and show to show, so trying to give you advice on how to go about it without knowing what the venue looks like, it's actual size, the audience arrangement, the stage placement, your experience as an engineer as well as what type of PA and how many boxes you have at your disposal is at best a wild turkey chase.
You keep mentioning the Deltamax boxes, are you actually planning on using them for this gig? As Special J already said and IIRC these are mid/short throw boxes that wouldn't array very nicely, and would cause a bunch of problems in a big hang. To answer your question about power, the systems I've been involved with to cover 10-20k people are usually right around 100kW. I still don't understand what you mean by "pattern". Are you talking about coverage?
I apologize if we're not helping much, but we don't really have much to go on here. Where are you located, by the way?