Has anyone lightened 3 piece flywheel

Popped the box out earlier. Found I have a 3 piece flywheel. Has anyone lightened one before. I removed the back plate and found there is quite a bit of material to remove and as it's a 3 piece is it worth the effort. Picture of the thickness of flywheel after plate removed (poor quality sorry)
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Flywheel again better view
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Backplate in place
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Or anyone got a one piece for sale before I go through the effort
 
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