I assume that, atleast by the time of FNV, The Hub is the Economic Center of the NCR so perhaps similar to the Adobe Housing we see in NCR in FO2, but much larger and with alot more Merchants and Caravans. Since the City was built on an Oasis it would probably look like a huge city built around said oasis, bu realistically it probably outgrew it long ago.

(Shady Sands, for reference.)

By the events of F4 (2287) it's described as being the largest settlement in the Wasteland. Not much else is given but we do get a glance in NV and the TV show what the real successful postwar communities out west look like, so the Hub should be something like that.

The Fallout tabletop game is set to receive a brand new expansion later this year set in eastern NCR/Mojave Wasteland. Fingers crossed it gives us some great art of the West's cities.

Its orange and black and there's naked people