Utilizing the height of a big enclosure

[Pedroo]

I am now in the process of building a big wooden enclosure for my boa constrictor imperator. It will be a high one. To utilize the height i like to install 2 wooden boards inside the enclosure on differant corners. I am not sure how to do that. If i use screws i am worried that i might damage the enclosure and the wooden board won,t be able to bear the weight of a large snake and it would break up. Is it possible to install such wooden boards inside a wooden enclosure in which they can bear the weight of a large snake? What other ways are availabe other than installing wooden boards, in which i could utilize the height of the enclosure? It will be a 4,60 feet high (55 inch).