The way I have setup Bespoke shipping I have four zones - North Island Urban, North Island Rural, South Island Urban, South Island Rural. Each of these zones have their own set of rates assigned which I have taken from my eShip(Courier Post) account.
As seen here in my profiles:
My zones are constructed with postcode rules.
This is an example of one zone with it’s coding:
And here is the more readable rules for that same zone:
I have a copy of the postcodes preformatted for these rules if you would like a copy?
If you get stuck I would be more than happy to have a look at setting up your shipping rates for you.