Need advice about insurance after an accident

[grantmr]

Hi. First post. I've got a 2000 Boxster S and had a run in with a stationary object. I bought the car for $27k (Australian, it's a fair price) and have full insurance cover. Agreed vale is $21k.

The damage assessment was for $12-14k. This seems a little steep as there's no mechanical damage, the rear fender and exhaust were the only damaged items. It drove exactly the same after the accident. I think the repairer has quoted for new parts from Porsche.

My question is this - how likely is it that the insurer will write the car off? Is there any way i can minimise this happening, like using used parts or offering to pay a larger excess.

I really don't want to lose the car, it's got sentimental value and i wouldn't get one anywhere as nice for $21k. Anybody have experience or advice?

I can provide a photo of the damage but at the moment I'm still hiding my shame. So embarrassed. Aquaplaned into a freeway divider at freeway speeds.

Thanks.