Where to start with complex shape - sculpture

Oh boy how do i make this model from my sketch. For now it doesnt have ro be super accurate but something to help me explain the concept. By the way its 6 metres tall. Thanks in advance to this clever community.

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I am not sure of an easy way to texture it like that. But the base shape, I think you are going to want to draw the cross-section at various points and loft

Something like this