This is probably something that I should have created as soon as this forum group came online, but strangely enough, the idea escaped me until today. Previously, I had been posting updates on the construction of the Circuit of the Americas in the round-up threads, but because not everybody sees those posts (and because I’m currently in the moderation queue), I decided that it might be a good idea to keep everything in the one place. However, I’m so late in the game that most of the construction has been done.
As a refresher, this is the state of circuit just over six months ago:
http://a2.sphotos.ak.fbcdn.net/hphotos-ak-ash4/s720x720/300199_223973690998805_125170184212490_613918_1805753455_n.jpg
And with just over six months to the race, this is what it look like now:

But that’s not all – here’s a selection of photos dated two days ago, starting with a close-up of the pit building:
https://fbcdn-sphotos-a.akamaihd.net/hphotos-ak-ash3/577519_458699627477921_157330087614878_93719821_1133087035_n.jpg
And the main grandstand:
https://fbcdn-sphotos-a.akamaihd.net/hphotos-ak-snc6/181477_458700297477854_157330087614878_93719835_1837826106_n.jpg
This is the retaining wall between the paddock and Turns 16-18:
https://fbcdn-sphotos-a.akamaihd.net/hphotos-ak-ash3/540662_458700227477861_157330087614878_93719833_1108460547_n.jpg
You can also see the test layer of asphalt at Turn 19 in the background.
For more, the Friends of Formula 1 Austin Texas Facebook group have a few galleries of construction on offer (that’s where I’m getting most of these photos), and they upload new ones fairly regularly.
I will (try to remember to) update this thread as I find new pictures and information. In the meantime, feel free to discuss away, or add anything of you own that you have found.