Which kit do you have? Revell released two different scales, there was a small scale plastic kit released in the 1980's by an obscure company in Japan. Scientific had a fairly nice solid wood hull kit, and Mantua/Sergal has a small-scale plank-on-bulkhead kit.
Unfortunately, all of the plastic kits are simply slightly modified kits of the Revell Cutty Sark's. The Scientific kit does resemble the Thermopylae, and the Mantua kit seems to do so.
Bill