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Try doing a search. I vagurely remember seeing a picture of a 2l coke bottle to mix the vinegar & bicarb, and the coke bottle lid had a hole with some plastic aquarium airhose connected to it. The other end of the airhose was then poked through the lid of a clear icecream-container sized container, which you put the rat into.
Tip the vinegar & bicarb into the coke bottle, quickly put the lid on and as the chemicals mix the co2 flows through the airhose and fills the rat container, and the rat dies.
There's probably a little more to it than that (chemical ratios and better methods of mixing the ingredients while capturing the gas, etc).
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