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I think you should go simple on this, first, closed loopback system need stability and there nothing stable in a motor going from stop to high rev with non-linear torque force on it, that why even in slower system like an engine they use mapping that run open loop in fast changing condition.
Second, I think, if you are afraid of restriction, you shoud use a bypass system, it does not take away any energy from the engine when you will not be using your supercharger.
Third, be careful about technical spec on component, MOSfet are not good for most motor control appication Ton-Toff are normally to long(so they heat up to much), use IGBT its like MOSfet but design for this kind of application.
I would go with a simple 8 bit PIC familly microcontroler(microchip), they simple to code, programmer dont cost much, and are stable in a wide range of temp(summer heat in car can get pretty high), oh and do not use a crystal for the clock use an oscillator, vibration will kill the crystal(made this error once and you do not want for full uncontrolable power on the elec. motor).
I least that a few thing I would think about if I would go into that kind of project.
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