I don't remember anything in the displays that suggested Starfleet origin. It certainly didn't seem to have a modern LCARs system, but even that wouldn't indicate much since those same LCARs displays are sometimes seen in civilian facilities as well.
It had movie-era (and still in use some twenty-odd years prior to TNG) Starfleet LCARS.
I believe it was, mainly because it doesn't really fit in the lineage of what we tend to think of as standard Starfleet designs. We've seen most types of shuttlecraft and runabouts embarked on starships, but we've never seen anything of a similar class or size of the Maquis raider in the fleet.
On one hand I do agree on this, as it's certainly not within the usual lineage, but then on the other:
1) We haven't seen anything much in the way of craft this size from TMP through TNG so we don't have a lineage to work from.
2) It's not the first time we've seen slightly oddball, unconventional Starfleet ships in general (I'm looking at you, Grissom!)
3) The impulse and warp fields, hull colour, and navigational lights are seemingly intentionally colored the same as most Starfleet vessels.
4) The torpedo launchers quite clearly appear to be Starfleet design (I know you'll argue they're a retrofit!

Mostly I just acknowledge that the studio re-used an existing model and badly upscaled it; resulting in a very much non-conventional design. I'd like to think that given a do-over, the Raider would be represented with a much more SF aesthetic!
We've seen lots of alien ships in a similar class -- Baran's pirate vessel, for example -- with the implication that most of these ships are privately owned or owned by small-time operators/corporations/governments and not part of a formal fleet.
True, but never any indication that they were not at some point built by one race or another's space navy - and possibly used for similar policing duties as the original Raider might have.
They're part of the actual hull NOW, but we have no idea what the hull would look like without all that stuff added on.
You're automatically proceeding from the assumption that those larger hull forms were not already there; I suspect the opposite is true (see previous comments about having existing interior volume for the crew, which would be difficult and time-consuming for the Maquis to bother retrofitting into the hull). I can see how there may be additional plating and bracing laid over the hull in some areas though...
Again, most of the "doodads" are literally glued onto the actual model from bits and pieces of other model kits. Note the original design lacks alot of those extra bits:
![]()
So in-universe, the same could easily be true of whatever the Raider was originally modified from. Being a larger ship than the fighter, the difference is likely even more noticeable.
Now see, I consider the opposite to be true - the bigger the vessel the more time consuming and (needlessly?) expensive it would be to make these out to be scaled-up additions over a civilian craft. If it were an existing Starfleet design though? Less need for additions to the hull, and easier to re-purpose for Maquis aggression!
Obviously I'm not talking about the outboard pods -or maybe even the wings- here, as I coud see these being subsequent additions along with the smaller doodads and greeblies.
Look at it like this: You're better off converting an ex-Army Land Rover for the zombie apocalypse than you are a Prius (unless you want to get into the subject of fuel efficiency

Nice image by the way, I don't recall seeing that one before! *clicks save*
