Off the top of my head, the emitter faces were slightly different between the two designs, the copper neck section, already mentioned the valve swap option on Stormpath, the semi circle notch on the fangs-Storm’s had it, Luuke’s did not, and the pommels were slightly different. Luuke had made his for his website, so he may have been first to do it. They drew from the same reference material as you. I never read the books either.
Nice stroll down memory lane on a Saturday morning.