Tesla Motors has released some drone flyover footage of its Gigafactory from December 2016.
This brief video is from before the start of battery cell production at the site and prior to the announcement the Model 3 electric motor production will occur at the Gigfactory too.
It provides us with a look at how construction is progressing (note the unfinished sections) while the site is actually in use.
According to Tesla, the Gigafactory (as seen in the video) has a footprint of 1.9 million square feet and 4.9 million square feet of space. That's only 30% or so of the size of the Gigafatcory once complete.