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Covering the entire room is usually not a great idea. It not only sounds unnatural, but the low frequency energy is much harder to absorb unless you treat with thick panels with air spaces behind. Even then, it's not foolproof, and you lose area inside the room as well.
Maybe as a compromise, if you still have your heart set on loads of 703 in there and no drywall showing, cover every other panel with pegboard (and fabric I assume). That will get a bit of energy back in the room. You can also use ply and cut or drill holes or openings yourself and then stain if you want to get more aesthetically interesting. There are variables having to do with perforated panel absorbers that I'd rather not get into right now... You can also use 1x4 wooden slats running horizontally to cover 50% area over the 703 on the walls. Alternate soft and hard on opposite walls, so if the top 4" is soft one one side, the top 4" is hard on the other. This retains some energy and adds a bit more complexity to the reflections. Again, you could actually design a slat/slot trap configuration and put a cavity behind, and even calculate a varied spacing for broader coverage, but again, more complex than appropriate for this. I'm just talking seat-of-the-pants stuff here which I think is what you're after.
With more info, dimensions, budget, and an idea of how complex you want to get, we might be able to suggest other things, like a proper trap at one end, or some other techniques as appropriate. Also, remember not to confuse isolation with reflection control.
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