I'd assumed a mix of stud-chain and best quality hemp. I'd assumed also that the strength of chain would be fairly constant over a number of years so current quality + or- 10% would be about right.
That said, the info from you John will be rather useful for Project X in the planning stage
As to the rest of the mooring, it's the question of whether 1", 1.25", 1.5" etc diameter would be believable for the period and does it really matter since indications are that the early boats really had to scrounge whatever they could from the cannon lovers!
Unfortunately, I've got two options for storing the rope in that (a) the oval bucket on the model could hold the thinner ones or (b) the plan shows a hatch right at the pointy end of the actual vessel which could lead to a chain locker if the heavier thickness was correct.
As far as the lines for the torpedoes is concerned, Derek, this particular boat was an odd one with a pair of MkIII impulse tubes (the ones with a piston that pushed the fish out) and no reloads.
Just to give an indication of how TB's were considered...
"
In 1884 matters stood as follows. Russia possessed no fewer than 115 boats, France 50, Holland 22, Itay 18, Austria 17 and England 19. This meant that Russia possessed one boat for every 18 miles of coastline, France one boat for every 33 miles and England One for for every 197 miles, or, including the colonies, every 800 miles!Plus ca change!