Sculpting the back armour with sintra

Twofoot

New Hunter
Sooooo. I've been making some armour from sintra and omg I wish I'd of used this stuff sooner instead of fibreglass. I've now come to moulding the back piece. There must be a tried and tested method of doing this using sintra. I'm guessing do a little bit at a time. But which part do I start with?? Any help would be much appreciated Thanks :)
 
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