a twin or triple plate clutch like that would probebly be the death of the gearbox from the shock torque loading that much clamp can put through,

can you get a clutch disc setup with a sprung center? maby just go for a single plate with a heavy clamp pressure plate, and sprung center disc and make the flywheel out of mild steel, also with the m104 if you make the flywheel too light you will get engine resonance/vibration through the car,