Keith you could do worse than contact Willy Pelzer
(kiwiwilly) He's based on the North Island in Wanganui.
He's a nice guy and i'm sure he could point you in the right direction.
If he's not too far away from you,you should check out his COE,it's stunning.
Good luck on your travels.
Edit: Just checked,he's 320kms from you.....About 4hrs drive.