Always good to hear opinions and conjecture. I am confident the front of the garage has a double wide opening for vehicles, and to the left of it, a single wide pedestrian door. This afternoon I stuck my head and camera through the slot for the overhead door and snapped two pictures. First to the left:
You can see the haunches on the left wall, the stone fill that was scooped in before the modules were set above, and the underside of the floor of the modules. That floor seems to me to be temporary, constructed of overlapping sheets of plywood on an inadequate floor joist system. I'd bet it will be removed at some point for a floor pour in there.
And, to the right, much the same, but with a view of the poured column which has some 2x bracing up to the floor which I believe is temporary.
Weather forecast for snow again Wednesday, not sure what they might be working on. And, to answer a question, I cannot see inside any of the living area to determine if there is a finished floor. But, I believe there is based on the website of the module manufacturer.
All for today, thanks for following my research project