Since this a custom fabrication, try thinking outside the box.
Your safe doesn't have to be safe shaped. You could build a rather flat and low stucture, for instance, that uses a long pull out drawer to access the contents. Even a small, cheap door would work with such a design.
Also, since you're building this, I've always felt that the best vault is not the most secure one, but the one no one knows about. Drywall is not very stought, but a properly hidden space will foil any criminal, and is easier to build.
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