Review:
initial pour was an 8ft by 8ft slab in interior corner of building.
Put down some plywood diagonally over the crushed stone base and rolled mixer right into corner....then kept pulling mixer out of corner (removing some plywood), was able to swivel extruder side to side to cover majority of area...this worked really well.
was surprised with how quickly 60 lb bag of concrete mix disappears from hopper, dedicated a man to just keep feeding bags.
some problems with variation of too soupy/too stiff mixture out of mixer, requiring water adjustment.....In the end discovered that lumps in the bagged concrete mix was the cause of that problem.