AKiCiF: Building a quickie skyscraper.

So is there any way to build a skyscraper fast without using concrete in its structure?

I'm thinking the Groupmind is going to want to build its Earthside Rest & Rec cities quickly to contain the populace, because tent cities aren't a particularly elegant solution. But the big concrete slabs in a modern building take time to cure I'm guessing, which would slow things down.

FYS: The Last Stand of Motorized Rifle Troop 239, Conclusion

“They're about to hit the three hundred meter mark,” Federov noted. Right where the minefield had been planted.

( Cut for grievous harm to a robot )