structure points are somewhat like wounds for a vehicle. they're used to represent the toughness of superheavy tanks and/or titans. you can find rules for them in the VDR or in the apocalypse rulebook as i suppose (never read through it though).
I cannot go too far into it without violating copyright, but consider structure points to be 'wounds' for a tank. You must drop the tank to its last 'wound' in order to do any lasting damage to it. So, a Baneblade with multiple structure points can take quite a beating before suffering any lasting damage or a destroyed result.
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