What about turning and resting the power core on its flat side, resting down on an incline from the top of the hull to the engines. It shouldn't effect the hitbox too much but if it does, you'll probably need to compensate elsewhere. It's only an experiment suggestion since you might be looking for something a little different.
Another thing is that the bent down wings are providing a even larger hitbox for the model and shield bubble. One thing you could also try is a swept wing design, angle the wings back slightly because with wings that large that strut out at that angle in a straight line is a little "Something that makes me twist my lips and go Hmmm" every time I look at them.
Also, the mid section isn't quite ringing the bell to a Rheinland design, its too "Smooth and scaly" in design with full honesty, it looks more like it belongs within the Bretonian designs.
Sorry if it feels like I've bombarded you with critique, but hopefully these suggestions might make the model a little more unique.