The Raven class is essentially a large runabout (40m x 45m) with the lower deck containing the warp core and warp nacelles embedded into the body, and the upper deck containing the cockpit, rooms, science labs and common areas like messhall and sickbay.
The aft part of the ship contains a cargo area which is big enough to hold and launch small shuttles.
The Raven class can serve as a runabout on large vessels, but it can also serve as a stand-alone science vessel like the Oberth Class.