I was trying to embed an image from my website, but TrekBBS won't let me. Anyhoo... a few years ago I did a deep-dive into the USS Surak, Spock's command from DC Comics' first series, which might or might not be an Oberth, as she changed from issue to issue, sometimes from panel to panel! (Personally, I think @JSnaith's McCaffrey-class is what the Surak would have looked like in "real life.")
It wasn't just ships. Tom Sutton's version of Spacedock is similar but completely different to what we saw in Star Trek III.
As @Avro Arrow said above, the art "had a certain charm." It made sense to me, the way Vonda McIntyre's The Entropy Effect or Diane Duane's 80s novels made sense to me as Star Trek, even if they weren't quite the universe the way it appeared on television.
