Honestly, for the time, effort and cost to repair it, you're better off scrapping it and buying something new. Once wood is damaged it's only worth fixing if you're experienced in doing so or want to spend money to do it right. Even then, unless its fixed by en experienced restoration craftsman it will always be damaged and not function properly.
Also, it is EXTREMELY important to make sure any silicone or sealants have dried, cured and off-gassed prior to putting any animal in the enclosure. The process will likely take a week or so if the enclosure is stored somewhere it can get a lot of air circulation.
Otherwise you're risking neurological damage and possibly death to the animal.
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