ABlockingVolume::GetActorBounds(bool bOnlyCollidingComponents, FVector& Origin, FVector& BoxExtent) should get you the bounds and origin of the volumes bounding box.
ABlockingVolume::GetActorScale(); should get you the scale of the volume.
ABlockingVolume::GetActorBounds(bool bOnlyCollidingComponents, FVector& Origin, FVector& BoxExtent) should get you the bounds and origin of the volumes bounding box.
ABlockingVolume::GetActorScale(); should get you the scale of the volume.