The show, and others, do well in showing "different sizes of Excelsior", that is, reuses of the saucer shape and certain details that create a family feel. The universe can well accommodate a "properly large Excelsior" in the form of the Obena, just like it accommodates "small Excelsiors" like the Centaur or the Curry. We also see a "small Sovereign" in the form of the Nova.
But there's plenty of room at the bottom for other things LDS so far has failed to show. How about a "small Galaxy"? The only time we saw those was "BoBW", with the half-scale kitbashes; some of those really warrant a revisit. Things like California or Parliament or Akira are Galaxy'ish enough, but all in the category of "large" or "very large"...
Timo Saloniemi