I've opted to go in a slightly different direction for my second Earth ship design. Initially I was thinking of an evolved version of my Endurance design only sporting two familiar nacelles and a lower structure undernesth the main hull. But as I thought more about it I was drawn to doing something more different. Yes, it has to look "primitive" by TOS era standards, but we could also begin to see some familiar elements echoed in the design. Also in James Blish's adaptation of "Balance Of Terror" there is a line where someone says the Romulans now have ships that "even look like ours.” That line never made it into the aired episode, but we do see a remnent of that thinking in Styles being suspicious of spies aboard the Enterprise after he sees the Romulans look like Spock. Also, if we take my little project seriously, then at this point in the series' production we have seen one other TOS or pre TOS era design: the Antares. What if the Antares echoed an older Earth design? And what if we take the line "even look like ours." to really mean the Romulans now have ships that look like what Earth used to have as opposed to what the Federation has now? I'm not proposing my design will look like an Earth version of a TOS era Romulan warbird. But what if the Romulans put their own spin on an Earth design that had been instrumental in effectively combating the Romulans and beating them back into their own star systems? And given the Romulans' arrogance they don't seem to recognize that Earth ships could have evolved greatly over the past century so they emulate something that is a century out of date when they decide to test Earth/Federation strength again.