I have heard of the trojan horse through many mediums. Namely, having a passion for history and mythology, I read about it in greek literature, I read about it in fiction literature based on greek mythology. I have seen countless movies on Greek themes, but the one I found most fun was in Greek video games such as Age of Mythology. In the game you need to create a trojan to infiltrate the gates of Troy. I found it to be interesting and brilliant at the same time.
I think it was a story that grew with the telling of it. People underestimate how observant and smart we as the human species can be. I personally think that with the transport of the horse, it would have been hard not to make a sound or to give oneself away unless you are fewer in number. If this was the case then I would suggest one maybe two people in there. Legends and making a name for yourself have been an important part of heroes and history. It would not be strange for the story to have grown out of the means of reality.
I would probably build it in the same manner one would build a ship (not todays ships, more of the 18th century wooden type.) The thing about the trojan is, it needs to give way for the person(s) inside to breathe but not have so many gaps and places to see through that it would give you away. Wood carving has truly expanded with the tools we have at our disposal today and Artisans have made the most amazing products. I would make sure that the carving is so intricate and complexly beautiful, that one would not want to see inside of fear of damaging it. Perfect for hiding in then.