hi guys.
I'm sorry but i would very much prefer the ship to be larger... my design originally was deep range exploration ship with capability to build starfleet installations (mining, outposts, subspace relays etc...)
It could not be a raider as standard due to the federations non-aggression standings.
my comprise to you is this:
have one ship as a pre NX corinium... what i mean is have the "pathfinder" as a modified soverign so original size then have the Corinium as the redesigned version that is larger and the production model.
i will redo the history to incorporate this if you want.
edit: here is the edit

NX CORINIUM
CORINIUM CLASS
DEEP RANGE EXPLORER / RESUPPLY AND REPAIR SHIP
The CORINIUM CLASS is a redesign of the SOVEREIGN CLASS, the CORINIUM is bigger and has many unique features that raises it above the Sovereign.
The CORINIUM has had many changes through out her design and construction, originally designed as a sovereign variant which would increase its speed and range by upgrading the warp core and adding two more nacelles, it was seen as some what of a success but not to the standards set in the design, the basic hull shape was re-examined and it was decided that a larger hull was required to allow for the level of exploration that Starfleet and the federation required.
The larger re-design was originally to house a large hanger bay in the saucer and also to have the warp nacelles mounted directly onto the secondary hull, it was decided during construction of the NX CORINIUM to forgo the hanger bay and instead create a ship that would exceed all others in exploration, Scientific research and Combat duties.
The nacelles were found to be problematic to mount directly to the secondary hull and so the ventral ones were mounted on small pylons and the dorsal ones were mounted on a third hull designated as TRINARY HULL. This Trinary Hull houses a second warp core which was to be originally placed besides the first in the secondary hull.
This configuration coupled with new breakthroughs in warp fields has resulted in a star ship that is 25% faster and 25% more efficient than the original Sovereign Class, this gives the Corinium Class a cruising warp factor of 7.5 and a maximum sustainable warp factor 9.9 for 15 hours (the sovereign was capable of just warp 6 and 9.9 for only 12 hours)
Due to the huge reserves of power provided by two warp cores the Corinium has the strongest shields and phasers in the fleet, an unusual design feature not seen on most explorer ships.
The Corinium Class has still the cargo capacity to transport or construct small installations such as subspace relay satellites, mining facilities and defence platforms. These facilities are automated until Starfleet can send follow up survey ships.
The Corinium Class was built in 2380 and was one of the largest ships in the Starfleet, she is based partly on tried and tested technology and partly new innovations. She resembles the old Constellation Class of ship and plans have been made to name one of the class USS STARGAZER NCC 2893-A.
The innovations with this class begin with her size, duties and construction and repair abilities but they do not end there. The Corinium Class uses the best technology available, that is not to say the newest but the most reliable and the easiest to maintain.
This class of star ship is hoped to exceed the famous Galaxy Class in exploration and scientific research and it is hoped the Corinium will exceed many other previous classes depending on the duties assigned her.
The Corinium Class is a true multipurpose star ship.