Well it's still very rough state I take, so I wouldn't make it a crux. As long as you are aware and plan to revisit the choice, should be fine, although I'm not sure if it helps in testing as metal has quite a distinctive sound?
As a rule of thumb that metal is used for catwalks or narrow sections of floors, to cover a hollow area that hosts cabling/piping. You would want to alternate with grates to show such details as well. Being a non-slippery surface, it wouldn't go up to an edge.
But the danger trim you are using is incorrect, the way you are using it is meaningless, doesn't bring attention to anything. Those trims are to be used to highlight height differences (steps) or lower overheads. Eventually an area of maneuver for big machinery.