Why wouldn’t the bounding box match the result of baseMesh.getBoundingInfo() though? As far as I know there’s no such thing as a local getBoundingInfo that would go along with the local bounding box.
I tried what you suggested, and it’s not showing a box with spheres at the corners.
I would expect the bounding box to be a world-oriented box the size of the two spheres placed in the world. Right now the the showBoundingBox property doesn’t match getBoundingInfo() returns.