I have a 1977 120Y four door sedan FARM HACK (has a BW diff

) I have removed:
Carpet,
Hoodling,
All associated "plastic crap",
Heater (may return),
soundeadening behind heater,
unneeded srcew on brackets,
plastic cover over handbrake,
Doortrims (put 'em back on - didn't want to be bitten by a well hidden redback!),
I recently replaced the factory (stuffed) 3N71B 3 speed auto - with F4W60L - 4 speed manual,
It also has a hotdog muffler under the passenger seat

I could also remove the front passenger seat, rear seat bits, and relavant seat belts... but I occasionally have passengers so I won't do that.
do a search for "The Defect" here on Datsun1200.com
probably about 20Kg ligher than a standard 120Y manual (probably about 655) stock 4 speed (aussie) manual 120Y is 675)
but then again it has the auto tunnel - don't know what weight difference there is there...