@BrentBranch You’re spot on, that matches what I’ve found too 👍
Standard MDF is usually the best balance for MagicMirror frames and back panels if it’s staying indoors: stable, easy to machine, and very paint-friendly once sealed and primed. MR MDF only really makes sense if there’s humidity involved, and while ply is stronger, getting that smooth painted finish takes more prep.
Appreciate you sharing your experience, really helpful.