This plate is a 3.5mm thick double layered fiberglass laminate sandwiched into an acrylic substrate. PRINTinZ plate is designed to be attached to your build platform.
You can machine the surface to fit a custom build plate.
You can saw the plate to a smaller size. A band saw is recommended for this. You can also drill holes if necessary using standard practices for acrylic, such as tapered drill bits. Rough edges of the fiberglass laminate skin can be very sharp - please take precautions.