FFP3 for MDF cutting and sanding work?

Hello dear community, I want to build something out of MDF that I'll be sawing and sanding, but not spraying. For that, I need to know what type of mask I can use to protect myself, since MDF contains formaldehyde ( https://en.wikipedia.org/wiki/Medium-density_fibreboard ), which can enter the lungs via particles and (according to https://www.cancer.org.au/cancer-information/causes-and-prevention/workplace-cancer/wood-products) can…

Which material is suitable for making a photo wall with a head hole?

I want to make a wall with a peephole that you can stick your head through. The wall should be approximately 180×120 mm in size. What material is suitable for this? What can be painted, certainly with (but preferably not too much) pre-treatment? What material is stable enough even when placed on feet? Where is…