I have a back room in my studio that is used as a gear docking area or back the van into etc to unload gear. the walls around it are sound proofed. I want to use it to put another guitar cab in. I was thinking of just making a closet with 8" insulation on the top, 2 sides and bottom and just pointing the amp into it. Will this work or should I build a whole iso cab? And how whould I go about it.