It's about 1,771 meters long.
This is really cool, my only complaint is in how the landing deck nacelles are connected (at angles instead of horizontal), the two aft shuttle bays, and what looks like landing gear on the belly. Other than that it's a great looking design and I love the combination of franchises.

It also reminds me of a ship I made a few years back.
May I suggest getting rid of the blue grill on the rear of the warp nacelles, or making the impulse engine grills more white? When you make the fighters, why not go with Trek sized fighters instead of Galactica sizes, but with Galactica shapes? That would mean something like 34-60 m long fighters.