I was wondering why you guys keep saying it's the "Intrepid"? Where did you get that. Was that "official"? (Really, I could have missed it. Wondering the source for that name. I don't remember anyone naming it on Enterprise)
Also, as an addendum to the models history, it originally was designed just from the back end for the opening titles. The next season when we needed some "older" Starships (than NX-01), John Eaves went ahead and truly finalised the complete shape as was seen in the episodes. However, since this was considered a more advanced production version, the back end old style rocket exhausts where deleted and replaced with more "advanced" nurnies and greebling. The first appearence of these ships was not on one of my shows, so that is to the best of my recollection.