Portable Booth for Hearing Tests

Hi, Thanks for reading this. I have been reading and reading and reading about how to successfully build a "sound proof" booth. I want to build a booth (6 x 6 would be great, but it could be other shapes for better noise reduction if necessary) for hearing tests, which is what I do for a living. The space where the booth will be: a large auditorium like area with ambient sounds like a radio, conversation, etc. I have measured the ambient noises with a sound level meter: about constant level of 60 db - maxed at 70 db). The auditorium is tiled. The booth must be wheelchair accessible: 36 inch door with a turning radius of 30" inside the booth (so a full circle with diameter of 60" must be clear in the booth). I will build a ramp to get into the booth. I also would like to have a window on the door and maybe on another wall. The major dilemma is portability... I need to build something that can be taken apart once and assembled once. To start, what are your recommendations for wall design? Can I potentially use two layers of MDF as a wall panel? I'd like to achieve STC 50 if possible. Thanks again.

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