A couple quick points. 1) The Constitution was the only TOS-era ship seen until the insertion of the J-class and the Daedalus-like Medusan ship for the remaster. The Saladin/Hermes, along with the Ptolemy and Dreadnought, were excommunicated because Roddenberry had a snit about royalties. This means that we have only limited insight into where it fits in the grand scheme of things. It may be the last holdover of the cylindrical style of nacelles. 2) The Andorian Nacelle Consortium finds your inclusion of the NX but not other pre-Federation starships insulting.