custom tanks

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well I guess the topic says what I'm here for. I'm interested in building my own custom tanks I've recently spoken with someone in real life who does it and gotten a few ideas. I currently have a 55gallon aquarium, a 90 gallon, a 125gallon, and about a 400 gallon I am interested in custom building my own at about 800 gallons and am looking for anyone who might be able to help me with the basics. I've been told I should use normal glass since tempored cannot be drilled. But I really need to speak to someone who has done this before and knows how. Possibly a diagram or something to help.