19
So much for that "massive area"
(pxscdn.com)
I chose this area because I thought that I'd have room to automate all the super early game mats and build my space elevator. Now I'm not so sure. Right now I have iron plates, iron rods, screws, wire, cable, and concrete automated with smelters ready to set up copper sheets the next time I play.
Oddly, after building more it looks bigger again. I'll post an updated screenshot next time I play.