The mechanical problems of assembling the sphere have been worked out. It requires a fairly complex jig with hydraulic actuators and retracting sleeves. When you say the magnets will 'flip', do you mean physically or magnetically?
The mechanical flip can be stopped, as I said. The internal magnetic 'flip' or demagnetizing is a function of the B and H curve of the material. For 55MGOe NdFeB the ratio is about 7:1 so if the imbalance exceeded this ratio the magnet would fail.
In the proposed design the magnetizing force and demagnetizing force is kept in limit by the pinned flux.
The greater the contamination of the super conducting material, the greater the pinning and 'draining' of one side of the circuit.
The device does not require the addition of energy for containment, like a Stellarator or Tokamak, as it is a relative field block not an external field bottle.
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