Are you talking about the Star Trek Guardian of Forever? If so, I would suggest finding the small model they made of Kirk and Spock and the Guardian. You should then be able to take those measurements and just multiply them out. Also, if you could find someone who has been on the superb Star Trek Tour that is traveling the country, I believe people are allowed to take photos very close to it!
I don't know if those two options will help, but it will at least be a starting point...
I wish you the best! Post photos of your progress!