I have an idea for an alternate look for a dreadnaught. You know the Federation cruiser from Starfleet Battles? It's warp engines are straight out instead of angled up over the primary hull. What if we take the warp engine nacelle and pylon, and put it in between the other two warp engines on the secondary hull and put the shuttlecraft hanger on the underside of the secondary hull like it is on the NX 01. Like so:
From:
http://www.star-ranger.com/SFB.htm
I am actually working on a sketch of this right now and it'll take me a few days to get it done.

From:
http://www.star-ranger.com/SFB.htm
I am actually working on a sketch of this right now and it'll take me a few days to get it done.