First Post - DIY Booth Issues

Hello everyone, Im researching a DIY vocal booth for my project studio in Brooklyn, NY. I will be putting up three new walls, off of the studio itself and have some questions about how to treat the room... Firstly, the space in which I'm putting up the walls is about 5'x4' so I want too avoid excessive layering in order to maintain some of the space within the room... Ok, here's my plan - I want to fill the space between the studs with Roxul AFB Mineral Wool 2-inch, then, on top of that, use some OC 703 or 705 (1'' or 2'') as drywall (not sure if this is recommended) --- and to add one more layer, for diffusion and aesthetics more then anything else, I want to add 1'' pyramid foam with some adhesive--- Is there any redundancy in my plan? Do people use OC 703/705 as drywall? Will the fibers from the OC cause my untimely death? Will the mineral wool even have any effect on the booths sound because it is behind the foam and the OC? If you were in my shoes how would you go about treating these walls? Thanks so much and I'm glad to be part of such a progressive forum.... John

mantra: "Please progress a bit further and follow them stickies." hummmm...

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