Morrell;
I don't have a direct answer to your question, sorry. But, there are some things that it would help to know. Is this also going to be a panic room? If so, then there's a whole bunch of things that need to get laid out with your builder.
I'd look for a construction company that's built a bank recently in your area. If nothing else, they should know who can properly do a vault room.
I, of course, will be glad to provide you with the vault door.
900F