At most 40ft of coverage depth required...about 30ft coverage required horizontally out from the downstage edge of the stage. Not enough vertical space for a legit array, nor do I really think it makes sense, unless someone can explain to me otherwise...
Looking at D&B Q10 pair per side, or L Arc II 3 per side...
SB28s, or similar...
Looking for something that can put on a 'full on rock show.'
Suggestions?
Buddy Guy's in Chicago is similar. Wide stage, wide room, short throw, coverage required on sides of stage.
They went with PS-15s hung across the front of the stage. I'll guess it's a mono mix. The PS-15s appear to be spaced so that coverage patterns converge properly (disclaimer: I have not heard it, just seen it). The asymmetric HF device could be an advantage here.
PS-15s on the outside service those areas.
You'll likely use the PA to fill in what can't compete with loud amps and drums.
Q10 is a perfectly good choice. Model it to make sure you don't have coverage holes up close. You may need something to fill in the corners, as well.
On a budget, EV QRX 212 is available in a horizontal format, and has an asymmetric HF, although different from the PS series. Horizontal 212 has HF in the center BTW.