Gidday
Very tough question to answer as so much will depend on the condition of your car. There is so much that can be wrong with a Z and often it can't be seen until work has commenced
An additional variable is the quality of work you want. There are some questionable workshops who would bodge it up for far far less than quality, and correct, work will cost.
I realise this doesn't help answer your question but without having a really really good look at start point the most you can expect is vague guestimation that could ultimately lead to disapointment.
I would be taking your car and the photo to a few repairer for a detailed quotes.
Cheers
PB