The only problem with making your own is that it would look out of place against the official models. On the Ent-F, the registry and name are curved while on my Arcadia, they're not. Also, I believe that on DJ's models, he adds a reddish line around the letters and numbers to increase canonicity. I didn't. And the main reason why I think DJ didn't do the Dauntless was because its not canon. Even though its a prefectly good name for a whacking great big spaceship.
Nice wok Glenn.