| Alunium/fibreglass/steel/carbonfibre?
Didn't realise that they raced at Greymouth as well - seemed such a peaceful place when we passed thru in 2006. Those nasty noisy motorbikes...
Alloy gotta be better than fibreglass but I'm not sure anything would've survived that - full weight of the flipped bike as it returned from orbit, closely followed by a direct hit at speed by the following bike.
Steel/alloy would deform before rupturing - but what happens to carbonfibre tanks when subjected to forces that they can't cope with? | 
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