Replaced half the instrument pod glass on a spare pod a couple of years ago due to crazing. A pain in the bum but doable. A local plastic workshop made up 2 halves and a full glass with markings for $20.00 Au. So I replaced my pod with the repaired one and started grinding out the glass on my original. I'm going to leave the clock glass and set buttons and fit the replacement around them. Slow tedious job but I'm not in a hurry as I'll just use it as a spare.
Regards Martin.