Materials needed to build a little library

I want to build a small free library for our community to share the joy of reading It will be placed at the front of the house However I cannot afford to purchase materials. So if anyone has some spare raw materials to donate, I can build one Just need smaller sizes not full sheets Old material is fine does not need to be new, but should be sturdy enough to survive our 🇨🇦weather. The Library material dimensions will be *Housing Exterior plywood (7 parts Front back sides roof base) 18–24 inches wide, 12–18 inches deep, and 20–30 inches tall. *Roof Cedar or asphalt shingles or metal sheet *Door Acrylic sheet. 12 x 12 (door window) *Support Post 4x4 x 5 post for support ( pressure treated. I have screws and tools If you have any left over exterior paint - any colour is fine just need the basic materials Especially a small piece of clear acrylic The picture is something similar to what I want to build. Cana anybody in Scarborough Area help with donating spare materials ?