Sorry guys,
I had a call back from the assessor today who said it will be repaired totalling an amount of $14,000.00. He said the damage wasn't as bad as it looked and that the rear subframe (i think) is damaged and would all be replaced with new OEM. I pleaded with him that my concerns relating to the continued safety of the vehicle, colour mismatches and of course poorer resale would be issues and that i should not be subject to these for such a new car, especially when the accident was of no fault of my own but it seems to have fallen of deaf ears. What is strange is that the assessors usually approve the repairs whilst on site but in this case he did not after my phone call yet it's all a very clear cut case. I am hopeful he has gone away for the night to review some figures (salvage etc) and may come back with a write-off order but i don't think i am lucky enough for that.
Kids safety over money? Yep, money wins.
As for the earlier question about the pre-tensioners, no, i didn't feel anything other then being forced hard into the seats when the other car hit.