Well that was quick! It was only last Wednesday that the land was cut and filled and I was told to expect work to commence early the next week. In reality though they must have started work on the Friday/Saturday and completed the piering, drains. All the form work was complete by Tuesday, so with ANZAC day being Wednesday I guessed that they wouldn't do anything until at least Thursday. So went and had a look after work yesterday and sure enough there was the slab. So I am guessing that the concrete will be allowed to cure and harden for the next week or so before they start work on the frame. Very happy with the progress so far, am hoping that the rest of the construction process moves along at the same pace!