I too feel like it is supposed to be huge, capable of providing resources and support to whatever planets are in need as deemed appropriate.Y'know, in looking at this design, and judging by its window layouts, it appears to be quite huge. There are three rows of portholes around the rim of the saucer, and looking at the underside, it looks to be nearly as big as either a Galaxy or Nebula. It's probably more likely a contemporary of some of the Wolf 359 ships, like the Niagara. I think I'm going to take a stab at a schematic on this one, although my top and rear views will be purely conjectural (for now), and use the Niagara's saucer as a starting point.
It also appears to be very utilitarian in design, so hopefully the crew are not fixing it constantly.