The odd thing is that the modelling is really kind of rough when you study it closely, with exposed wiring and electrics all over it (including choc block terminals!), and those stacks of metal bars which I assume are either lead or steel, to give weight to the whole thing (it's apparently 10kg according to the write-up!) - but because the "real" tamper machines are themselves such a mass of pipes, cables and equipment, the model actually looks surprisingly effective - it just has the right "look and feel" to it.....
Jon.