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Guinea Pig Cage

I have a Guinea Pig cage ( see pictures below) which is too small for my piggies. I just bought the cage recently and I am looking to somehow modify it to make it bigger. I am looking for something simple ( an hours job) Please contact me if you can do it for a reasonable price. I It’s fine if the legs have to be chopped off. If we could agree on something I may have another cage which also needs modifications