Summary

This is a 2mm thick key plate for the ferris sweep high keyboard.
It can be used to have more stability especially when using 3pin mx keys.
Plate thickness could be reduced to 1.5mm so the keys actually snap in, but it might not be sturdy enough like this.
At the upper left corner (on the right keyboard half) it protrudes a little bit (see second image). Besides of that it fits pretty well and is almost not visible.
Right now i am typing this on my ferris sweep the first time and it takes forever:D