I thought Plane like ships are not welcome anymore.
Never mind, use your fantasy, let your mind flow. I could give you some suggestions, but it is your model and not mine. You will have other imaginations than me. As i have said before, make a concept. You must know which faction you want to design it for and for what purpose. Then use other models of that faction and purpose as references. Start modelling without a destination is a hard way and your first model wont be perfect.