You can always make one out of wood, but you need access to tools (Chop-saw, Circular saw, and/or table saw). Plus a way to fasten the side together (nails and/or wood glue). Do you have acces to these things? Personally for the larger snakes I would get a differnt enclosure because of the stregnth these creatures have. If not then it's time to weight down the the tops with something heavy (books, weights, be creative). If you do have access to the tools I would be happy to walk you through the building process.