Hades your model's good but one thing I'd suggest changing in favor of a more "Rheinland-look" of the ship is to re-work the rear-end of the thing including the engine section and mayhaps have it be one of those ball-shape rear-ends as seen on the Rheinland Cruiser and Rheinland Battleship, possibly not as wide so that it would look less of a ball but still keep the distinctive appearance. The rest of the thing looks bulky, rugged, and ugly enough to be a Hessian warship and a Rheinland one for that matter, but the rear-end kind of doesn't look Rheinland enough in my opinion.
I'd also suggest flattening the bulge on the top a bit more, because it's that bulge that kind of gives the ship the overall feel of resembling other ships too much. The Mako has it, the Liberty BS and BC sort of have extra "fat" in the middle too, and the RMBS has a bulge of its own. Your model looks, bar the aforementioned rear-end, Rheinland enough without it already.
Including the RHA symbol on the ship is extra-awesome btw. =D