I think the best advice for anybody undertaking a model of this ship is quite simple: unless you have some excellent reason to do otherwise, believe Mr. Campbell. I imagine the research done in conjunction with the current restoration will reveal some inaccuracy in those plans (such projects always do), but I'm not aware of any so far.
There's a short but intelligent, and well-illustrated, article about the Cutty Sark restoration project in the current issue of Wooden Boat magazine.
Among other interesting things, the article points out that, in trying to make the ship last into the indefinite future, the conservators are doing something the original designers and owner never intended. The researchers guess that old Jock Willis figured his ship would last - and make money for him - for twenty years or therabouts. She's now survived for 120, and it's hardly surprising that she's showing her age. Just as one example, the builders fastened her hull planking to the iron frames with nothing whatever between the wood and the iron - a sure-fire recipe for corrosion and rot, especially when water (salt and rain) was added to the equation. The shipwrights may well have known that, but figured it didn't matter; if the frames started to rust a little after twenty years, who cared? The conservators are coating every frame with some sort of hi-tech epoxy paint, which will effectively "encapsulate" all the ironwork. And the original hull fastenings, which were made of Muntz metal, did just fine throughout the ship's active career, but now show signs of serious deterioration. (Removing them from the ship presumably didn't help.) The replacements are being made, surprisingly, of fiberglass. The chief conservator says it's actually, ounce for ounce, stronger than steel in such applications - and, obviously, corrosion-proof.
The conservators are making sure that the new, replacement components are "visually differentiated" from the original parts (i.e., that it's fairly easy to tell, by eye, what's original, 1869 fabric and what isn't). They estimate that, surprisingly, as much as 90% of the ship's original fabric has survived. The individual hull planks, for instance, are still in existence; they were removed from the frame back before the fire, and have been carefully maintained under tension since, so they won't tend to spring out of shape when they're put back.
Though it undoubtedly will have its controversial aspects and its critics, this project clearly represents the state of the art in ship conservation and preservation. Personally, on the basis of the designer's drawings I've seen, I'm honestly not sure whether I'll like all the aesthetic aspects of the result or not. Frankly, I've always liked the way she was exhibited before - in her drydock, with the waterline at ground level. To my old-fashioned eye the artists' renderings of the planned new installation system look a little...well, on the wild side. But I'll cheerfully reserve my opinions till the job is finished.
And my wife seems to be entirely supportive of my desire to get back to Greenwich at least once more. (That was one of the stops on our honeymoon.) She (the ship, not my wife) is scheduled to be open for public visitation in about another year. That looks a little on the optimistic side, but maybe, just maybe, for our twentieth wedding anniversary in 2011....