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