It is suppose to be flyable as well for mission that need something smaller, but with more power or a punch of a shuttle. If I can find the STOKED episode where Al said something like this I will link it.
I think Geko originally described it as Rapier-like. So it's more of an Escort then a Small Craft like the Peregrine. But that's just my guess. It's load-out seems much more advanced then what you see on a Peregrine.
It could be a sort of super-runabout (though the Peregrine is already about the size of a runabout) or more akin to a patrol boat. But at 140-170m it does sound more like a fully-functional starship in its own right.
Which makes it being carried by a mothership of some kind.. all the more odd, all in all.
Going by the game's 170 meter figure for the Defiant and the scale of the Odyssey in relation to the support vessel, the Aquarius escort is 140 meters long, which is bigger than a Bird of Prey or a bugship.
I hope it's an escort that can summon the larger Odyssey either as a pet or a ship to dock with that acts as reverse-MVAM armor.