In message ,
newshound writes
Perspex is a bit brittle.
In my garden shed here, I have a DBX card mounted on "perspex" to adapt
it to a 19" rack while keeping it insulated. The perspex (whatever it
actually is) has indeed shattered.

I always liked American valve guitar amps that used what looked like
vulcanised cardboard as the "chassis". Perhaps cut up an old suitcase?
--
Bill