Using Gore-tex to modify my case and waterproof my iphone speakers?

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I owned a lifeproof case and it worked wonders. I've been able to keep my iPhone water-proof, dust-proof, shock-proof and snow-proof. Unfortunately it's not rabbit-proof and after only a few months of owning the case, my rabbit somehow escaped her cage and jumped on my bed, making a meal out of the rubber lifeproof case. That made the case nonfunctional. I finally bought a waterproof case from coolcovercases (because they're cheaper and my rabbit for some reason doesn't and won't eat the rubbery material) for my iPhone. It works well too in keeping my iPhone water-proof, shock-proof and dust-proof, but there's one huge drawback. If I use speaker mod when calling someone, the sound echos because there's no opening on the bottom for those speakers. It becomes extremely heart to hear the person on the other side unless i switch off speaker mode or take the phone out of the case. Even then, there's a slight echo. I want to modify the case and cut two holes for the speakers on the bottom of the case, then superglue gore-tex (a water-proof and breathable material) to cove those holes. Gore-tex is the same material used in the lifeproof case to water-proof the speakers, but also allows those speakers to play sound clearly without echoing or muffling. I'm not entirely sure how to go about doing this exactly but has anyone tried something similar? Is gore-tex really that water-proof. I mean the gore-tex material on the lifeproof case works amazingly well when I tested it by submerging in the case with tissue paper inside for an hour and that tissue remained dried, but I was hoping to hear other experiences so I can modify my case successfully. Thanks.