Re: 22nd century star clipper...
My idea is the laser emitter (canon, battery, whatever) is a swivel type thing that can pivot to cover a wide field of fire. On a more combat oriented version of this design you could have more such arrays in the aft section as well as the saucer. Or some of the sensor arrays under the saucer could be swapped out for a heavier duty version of the laser emitter. If you look at those pods on either side of the aft section you could envision missiles being launched from there fore and aft facing.
STAR TREK: 1964-1991, 2013-?