The ZS is only about 950 kg to start with then...
-removed rear seats (bench and backs)
-removed all the carpets
-all the sound deadening
-removed Rear Door cards
-Carbon fibre front doorcards
-Carbon fibre wing mirrors
-Removed all plastic trim (a pillars, b pillars, c pillars)
-removed boot skin
-Removed rear wiper and motor
-Removed roof lining
-Seat belts and tensioner
-Spare wheel
-Bucket seats

Basically anything that can be lightened do it... and anything that can be taken off do that.. i litterally have taken loads out, but a lot of people go even lighter.. ie half dash, removing PS, etc

Its very noisey in my car, you can hear everything..lol stripping is defo worth doing in my opinion...