I think what Diane did in her books was portray the Enterprise as we saw it in the first half of season one of TOS: a place where Rand cracks wise about using phasers to heat coffee, where Sulu cares for plants that look like gloves, where Uhura sings a song that makes fun of Spock in the mess hall with Spock himself accompanying her on the ka'athyra, where Kirk jokes with the guys in the gym, where Sulu gives Bailey shit about trying to trade barbs with Spock, and so on.