My concern here is that if you lack the technical ability to calculate the volume of a tank, you could be biting off a lot more than you can chew in setting up a tank that large as a DIY project. 935 gallons of water could be a huge destructive force. If this tank isn't being setup in your back yard where when it breaks it will just wash away your grass and not your walls, base boards, carpet, etc., then I would advise against it (I would probably advise against it even then).
I am not knocking the idea of learning about a DIY tank... but maybe consider starting very small as a first attempt.
Just my 2 cents...