Save any small pieces. What I do is attach them together , that's is arrange them the way I want and use chopsticks cut to size as dowel pins for strength with some silicone. Instant dock custom made. I don't throw anything away , I'm a pack rat. For adult turtles I push my dowel pin in about 4" for extra strength.
I use ebay but be careful , they say 16-23" and what you get is more like 16" .