Danish,
The weight of an MZ20 will depend on the level of options and any extra aftermarket add ons. My car originally weighed well in excess of 1600kg. Gz's might be a little less, but not much.
After a massive weight loss program she still weighs in at just on 1300kg (with roll cage). Easiest way to check is to take it to a public weighbridge.
The doors on these cars are about 40 kg each!! You could hang a barn door off the hinges alone. Bonnet is 16kg. The seats make good container ship anchors, and there's enough sound insulation in the floor and firewall for a recording studio!
Well, they were a luxobarge after all.