Oh - that cabinet is neat! The machine may not be mounted simply because they took it out to make moving the cabinet easier. I remove all machines before moving cabinets. Won't take the chance of the machine busting the cabinet, even in short vehicle moves. All it takes is one bump in the road you hit harder than you expected.
Does your Davis VF take the shorter needles? Those that do usually have a scale etch of the needle right on the front slide. If it does, than it's the later model and will fit most other Davis cabinets.
I've got two early Davis machines that have different bases, and they are both very unique, I've got three later Davis machine, NVF, Vibrating shuttle and Rotary, so three very different machines, but they all have the same foot print (and all take the Boye 15 needles).