built in wall aquarium Qs

I'm planning on building a bigger aquarium using my wall, It's just that I have no clue where to start and what to do. Can any of you share your experiences with it? also upload pictures if you guys have some? thank you.
 
We are looking at building one into the wall as well. We have a closet under the stairs that would make a great aquarium work room. Have found a 240 gallon tank, 8' long, plywood on 3 sides with a glass front for $100.....but it leaks. My husband is skeptical. I am reluctant to give up the closet.....we are at an impass.
 
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