I think it looks really good.
In the model it's quite small. In the image bellow, the bigger guy and Lunar Shuttle is to scale with your model, and the smaller ones are about what I would suggest.
Maybe you could adjust the cockpit a bit, especially on the top to give a bit more view.
The nose feels a bit strange that empty, but it's appealing and industrial looking even then, so disregard the sensor dome I put to this image, I was just curious how it would look with it.
The nacelle is quite nice, but for Haber it might fit better if it would more blocky. Right now it's more towards the Kaluri direction. I quite like those little tanks on it.
I'd keep those fins as a Kaluri and MCS speciality, and move the heatsinks onto the nacelle.
Maybe you could try adding the same little rotating things the Lunar Shuttle has. I always imagined them as aux heatsinks, or comms equipment/sensor. Although for the later, it shouldn't be place that close to the engines I guess.
