Imagine you had endless amounts of money, access to all the skills and materials needed, as well as labour to operate, what replica's would you build? The situation can only be a dream, but I'd do two things:
A fleet of Napoleonic Wars period ships of the line, fully armed with period guns, and fully trained in period naval warfare. Naturally I wouldn't be firing real cannonballs, (except at jetskis), but it sure would be fun.
I'd also like to see a fleet of coal fired, steam powered liners built, maybe the best of each decade, 1840s to 1920s. They would be done properly and would showcase what the world has lost in stylish ship design.
What would others do? Would you build just one boat, or a fleet? Let your imagination run wild people.