Here is another "It was a good idea at the time" project for someone.
http://www.gumtree.com.au/s-ad/langwarrin/cars-vans-utes/datsun-240z-convertable/1091439386
It looks like an early 240z (71) chassis number not listed. You'll need a roof turret, some rear 1/4 panels and a "Ledge" to put this 1 right.
Asking $8,000.00 Negotiable
Langwarrin, VIC
Says it's unregistered.
If anyone calls, please get the chassis number.