Thankyou for this. I have researched some of the ideas you gave me. It seems that ACM panels would be really nice to try but are too expensive for me to use at the moment. So it is still MDF for me - the low formaldehyde type called Medite. I will have to learn how to brace it. but am encouraged by the recommendation to use glue at this site: https://www.naturalpigments.com/arti...nting-support/
I am not a woodworker and glue seems easy.
thank you Contumacious