Vondon,
Welcome to the forum. Not to pass the buck, but i'd honestly do some r&d over at Monster Fish Keepers forum. I believe it's monsterfish.com. A number of members there have made wooden aquariums, fully capable of holding large volumes of water. If you're up for the challenge, I think your answers would best be found there. UK and Europe have accessible many chemicals and product suited for cage building that we don't have here in the western side of that giant lake called the Atlantic Ocean.