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[Bonustokin]

hi Marzzy, if you want to make your own enclosure, Just use 9mm ply or something similar that will hold a bit of heat in and you can buy glass and glass runner track for your sliding doors....
These vents look tidy, you will need one or 2 for ventulation.....( the small vent down the bottom right)http://www.jakehowlett.com/gallery/photos/vents.jpg You can get them at bunnings or where ever, and they have fly screen or something like that on the back so the snake cant get out.... Just remember you are trying to keep one end on the enclosure warm, and the other end cool, so put your vent/s on one side.
Bill.