I think this design is actually real neat. A few things that might clean it up;
-I would move the saucer to be in line with the nacelles (The center of the saucer lines
up vertically with the center of the pylons.)
-I'd incorporate the two rollbars into one ring
-The broadside phasers look a little tacked-on the way they are now. Perhaps mounting them on a more substantial structure may help.