I recently made a new dash fascia out of ply also as my original plastic one had been butchered and cracked to fit the radio.
It may offend the purists but I decided to try something different and covered with perforated vinyl, may yet add some chrome trim to the speedo/tach.
Getting the hole spacings correct was little tricky but Im happy enough with the outcome......not perfect but pleasant enough I think.
That looks really well done, how did you ensure the holes were round when cutting?