I just checked the links on the Steel Navy site. It seems that Gold Medal's Titanic detail sets are all in 1/350 scale. The list is quite impressive: there's a basic set, an additional set of really precise details, and a fret of figures. There's also a link to a model that Mr. Perry built, incorporating all those sets, and it's pretty spectacular. But nothing in 1/400. The link to Tom's Modelworks establishes that that firm does indeed have a 1/400 Titanic set, and on the basis of the photo therein it looks pretty impressive.
I haven't gotten on board the Titanic bandwagon, but I have the general impression that there's quite a bit of argument over which kit, the Academy 1/400 or the older-but-updated Minicraft 1/350, is a better basis for a serious model. Clearly the 1/350 version offers more in the way of aftermarket parts.
I was disappointed to learn, in the FSM review, that the new 1/720 Titanic has significant problems. That scale is more to my taste for such vessels. I find it remarkable, given the current public interest in the topic, that there are so few classic liners in 1/700 or 1/720. Imagine what a curio cabinet containing, say, a Titanic, a Lusitania, a Queen Mary, and a United States would look like! Then throw in a couple of those beautiful old German ships, maybe the Normandie, the Aquitania....Well, maybe some day.
Youth, talent, hard work, and enthusiasm are no match for old age and treachery.