Mike, very sorry with the slow delay. My machine is in pieces in storage, and it took me a lot longer than I wanted to get it out and find the drip tray. I didn't have a metric ruler handy, but my drip tray cover has a diameter of 5 7/16 inches, and is approximately 1/16 inch thick (not sure what gauge, but pretty heavy). The large hole (for the 3 way valve return) is about 3/4 inch diameter, and the other holes are about 1/4 inch diameter. You can see that the holes are dimpled as well to encourage quick draining. The ridge underneath holds the cover in place, and is about 1/8 inch deep on the underside.
As mentioned earlier, the driptray cover gets scratched up quickly if you use ceramic cups. Mine is also a bit dirty

.
Here are a couple of pics:


Let me know if I can help any further.
Enjoy your experience, James