Somebody that would know more about the disposition of Harland and Wolf's original Titanic design documents is Tom McCluskie, MBE. ("MBE" means Member of the British Empire, or at least what's left of the British Empire - an honorary title awarded by the Queen.) Tom is a former employee of H&W and has written several books related to Titanic. He used to be a regular poster on this forum, but he seems to have gone inactive. You can Google him and find a list of his books that are available on Amazon, etc. He lives in Belfast and is on LinkedIn - where you might find his current contact information. Hope this helps.