I'm a relative newbie here, have just bought a UK spec 72 Z600 GT Coupe, which has been lightly modded by a guy about 5 years ago.
It has been debumpered, and repainted in black with blue detailing. Steel wide arches and a Fibreglass front air dam. Front indicators are Frenched in Mk1 Escort Ford items as are the rear lights which are mk1 Escort van, Frenched in vertically, which i definately plan to get rid of as they are terrible. The rear plate has been moved to the rear centre bumper slot which looks ok.
The car has 10*6 Starmag wheels like they used on old mini's, but I plan to replace them with some 13*6 Minilights or RX7 wheels if i can find them. I've also discovered that ATV's use the same stud pattern, so some of the aftermarket alloys for them may work out.
Here are a few pics from the auction where i bought it. It will be tidied up stock rear lights reinstated and repainted in silver with darker silver striping as they used to be.