1. Take the tubes from submarine and apply it to more Osiris-like battle-axe nose. Pair them up at the sides of said nose.
reference pic
Obviously, the launch tubes will have to be considerably much bigger than that, however they should remain part of the nose rather than nose itself.
2. Those wings are flat out weird to me. Jeremy told me they're supposed to be runways or something... Try hangar doors somewhere in the middle facing sideways, with a bigger/cargo doors below.
3. Entire ship needs a better shape. Look at Osiris and how its thickness, decals, windows varies per section. Make it fatter, longer Osiris while still retaining its own identity. I found a couple of concepts laying around that you may find useful.
4. Go ahead and attempt to double up the Osiris standard engine. To keep it from becoming too tall for the intended bulkyness, make it vertical oval with twin cigars merged stacked on top of another.