Im looking into putting an acrylic viewing window in a boathouse in the future. Need help as I don't see anything similar on the net except aquarium viewing areas that are below the waterline. Not sure how thick it would need to be as it is a pond/small lake and can't calculate how much water pressure would be on it. Anyone know of something like this that has been done and by who. Estimated cost as I'm sure it wouldn't be cheap. Thinking of an area of 12ft wide x 6ft tall.