I built an enclosure out of a desk. I want to do something with the walls, I tried with a pack of shims from Lowe's but found out it was white cedar which is toxic. Gallery includes walls and no walls. What can I use for walls that is safe? Bonus points if he can climb it?
https://imgur.com/a/NQpqO2d
https://imgur.com/a/NQpqO2d