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@Bobbo
As far as I see it the theory is relatively simple; have a series of circuits that essentially consist of a computer controlled switch and an electromagnet that form the track, these circuits are controlled by computer and switch on and off in order to produce the motion of the craft. To engineer it would however be much more complicated
You are making the assumption that the hovercraft thingies are constructed entirely out of superconductive material, I would suggest that this is wrong. If it were the case the entire craft would be a block of ice. What if there was a thin strip of superconductive material at the "core" of the craft that was surrounded by a lightweight material that is not effected by magnetic fields (say plastic)?
Please bear in mind that the article that you have cited takes a VERY complex subject that many academics in the field of physics have a hard time comprehending and boils it down into a couple of paragraphs. If superconductors do not like magnetic fields so much, why is it that one of the most common applied uses of superconductors is to generate unbelievably powerful magnetic fields in MRI (Magnetic Resonance Imaging) scanners?