Shelves or plywood (Ilminster)

Hi everyone 😊 I’m putting a little request out.
I’m looking for any spare shelving, wooden shelves, plywood, MDF, or sturdy wood offcuts that anyone no longer needs. Any size is absolutely fine. And FREE please.
I’m hoping to make some wall shelves and climbing areas for my kittens so they can explore up high and make more use of the flat.
Ideally looking for sturdy pieces that would be safe for cats. Happy to collect if fairly local.
Thank you so much 🐾