That is beyond amazing. Now I know why it's impossible to get hold of some lego elements, they've all been used in the great ball contraption...Have you seen the Great Ball contraptions?
If you like it look at Akiyuki's channel on YouTube. The GBCs he makes are incredible.
I have quite a few on display in my loft, alot more than the ones I posted previously, and yeah have agree the dusting aspect is perhaps the least enjoyable part of it, Lego is a dust magnet.not sure id want to either dust or clean these sets, ours have been built once and then go in the box