My BP is a climber, but he knocks down sticks we have propped up so I'm looking to secure some sticks to the sides of the tub so he can explore and climb his heart out!

I looked online, but most instructions were for glass or acrylic tanks, and not much help for plastic! Anyone have suggestions? I was thinking of drilling a screw into the wood on one end and putting the screw through the tub and securing it with a metal plate of some kind, but I'm worried that the wood would simply split!