418 lbs. is light in relation to a stock Guzzi. Dropped nearly 80 lbs.
Sure, it is not as light as new bikes, but the 'net' impact this Guzzi's weight reduction has on the bike experience may be more profound than any lightweight spec sheet when considering Guzzi's power delivery (especially for street use).
A carbon fibre backbone frame with airbox (like Ghezz-Brian) with aluminum plates & trellis sections attached (like Bimota has done with their bikes) would look better, be more cost effective, and achieve significant weight reduction. It also wouldn't have ties to the over-hyped Wraith.