visited yesterday 27th oct, they have now finished putting the roof on at the back and it looks like they are extending the indoor area for the orangutangs as the roof now extends from the original height of the front building.
It looks to me like the animals may now have almost the whole of the(original) inside house as cagespace. this would certainly increase their living space. Maybe the public will view them through windows from outside?
Obviously plans to move them elsewhere in the Zoo have been shelved/cancelled if they are doing major work here.