What I would do is: After loading the mesh I would parse all Vertices of the mesh and store Min xyz and max xyz, These can be used to create 8 Pivots that are representing a Box that completely and exactly covers the mesh. Then I'd parent the pivots to the mesh, so any further scaling will affect the pivot loactions too.
That's what I do too, or rather I make a transparent cube parented to the entity, and make only the cube pickable. That way I control exactly how the entitybox looks. I also make the cubes slightly larger than the objects, but that's another story. putting a 2D box around an object?
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