Take a closer look at the ceiling height of the laboratory and testing rooms, they are no where near the height of the warehouse ceiling, as such they do Not take up the other side of the warehouse.
Now take a closer look at the posts holding up the roof of the warehouse, these posts are Painted Yellow on the bottom and white on the top, They are next to the Yellow painted posts of the overhead cranes.
These half yellow half white posts run down the centre of the Manufacturing floor holding up the roof and Divide the warehouse floor in half, so the current 4 machines only take up a quarter of the warehouse floor area.
With 4 more BMG machines that can be further installed now with the current overhead cranes, that would fill just half of the warehouse.
To instal the other half with 8 BMG machines would require overhead cranes installed on the other side of the Yellow and White posts that Divide the manufacturing floor.
Therefore at a minimum this warehouse can hold 16 BMG machines.