Actually, you can follow some basic concepts from speaker cabinet design books! The idea is to keep non integer relationships between the six walls. This way no given standing wave is re-enforced. Note that solid walls reflect bass while the bass will pass through less solid walls, such as sheet rock and OSB. If the bass can pass through you are less likely to set up a standing wave in the room.
Likewise, dead rooms tend to kill non
coherent
musical distortions sooner than music, which is more coherent.
If you are really serious about this, talk to a professional sound engineer or architect who specialty is designing sound rooms. They will know what materials to specify and how to design the room to make the most bang for your buck.
If you are really serious about this, talk to a professional sound engineer or architect who specialty is designing sound rooms. They will know what materials to specify and how to design the room to make the most bang for your buck.