We, a group of game developers, are currently working on a VR project. We need a design for a sphere that has a diameter of 3m and, can be assembled/disassembled, and contains a hatch that can be easily opened/closed to make a human pass through it. If you want to know more about the design google "Virtusphere". If you are intrested contact me on :    omar.tarek2000@gmail.com