I began construction on a two story building. “L” shaped with a 4 block overhang at the front and a slab staircase going to the second story door. The hearthlings laid the floor as usual and then moved on to the slab staircase. They finished the slab staircase and 4 hearthlings immediately began constructing the second floor while a single worker began on the first floor. The second floor being in place prevented construction of some sections of the first floor walls.
System: Win7 home premium x64
intel core i7 @2.4GHz
12GB RAM
Nvidia GT650M
The biulding schematic
The constructed sections
Missing first floor sections