Mine was built using the RUBBER MAID large or extra large container, Hubby cut a window to one of the sides, i can put the lid for extra draft protection ... first few days we just use the container as the box, then i put one of those play yards around to contain the puppies and keep them safer as they start to walk. It fits right in the corner in my kitchen, he also 'drill" a hole on the back so i can pass the heating pad cord through it.
He did a very neat job !
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