BradMick has been continuing work on his WC3 model pack, with the Longbow being the latest addition. As with the previous models, the Longbow is designed to have a low polygon count so it is suitable for use in games. You can see the Longbow alongside the other ships below.
They're all scaled to a 6ft figure sitting in the cockpit. Based on that the scales are fairly accurate with said figure. In so far as the shapes go, they're all accurate. Referencing the in game meshes with the high res renders from the Warbirds deal, I've made sure I've got all the proportions and what not correct. Now, there are differences between the WC3 and 4 versions of these ships. Little things in the details, and some things in the proportions too. That may be why it's a bit off to some folks. It seems most are more familiar with the WC4 versions than the WC3.