Thank you JandM...
Excellent information ,and all covered

I'm hoping to do this : ChChurch => Tranzalpine by Highway => FJGlacier => Wanaka => Arrowtown & Queenstown => Milford Sound => Drive to Mt Cook = > Drive to Christchurch via Lake Tekupo & Mt Hutt

OR

ChChurch => Lake Tekupo & Mt Cook => Wanaka => Arrowtown & Queenstown => Milford Sound => Drive to Christchurch

Still trying to finalise the number of days available for me to travel, sooo excited to do this planning