Alexander makes a valid point.
If one that is complicated. Especially by things which have great age.
Let us imagine restoring a building first erected in 1890. If we restore it to historical accuracy, how much accuracy should we apply? Should we remove the electrical wiring; the plumbing? Do we need to restore gas lighting , if used? I have some experience in this in my architectural practice.
With ships, it is equally complicated. Some wooden ship design is predicated on use of leaded paint. But, government regulations on leaded products are complicated at best.
This has cropped up a mere 150 miles south of me, where the Galveston, Texas seaport museum has the restored Sailing Ship Elissa. Or had. The hull has been found to be unseaworthy. But, to the point, Elissa started life as a steel-hull barque. When she was found in a Greek ship-breaker's yard, she had been chopped into an motor vessel.
So, historically, one could restore here to either state. For the museum, it made sense to restore her to an in-between state, as an engined auxiliary barque.
With Cutty Sark, there is evidence that her deck houses were both painted and not pained. And also part-painted--there were fashions for this in maritime service. And, that's all before we get into how many deck houses Cutty ought have. Which complicates things.