This is the position in which the house becomes its own conservatory. The main outer envelope is slid back some 12 metres (in fact over the top of the garage block). This means that what was a courtyard between the three separate buildings now becomes a covered space. And the glasshouse is slid into action to cover the house and make it watertight.
The tricky bit in here is to make the joins all watertight and weatherproof. The two gable ends are stationary and the buildings slide over them - so each one needs a weatherproof seal, similar to the way sliding windows in a car require a seal.