This is entirely 3D printed along with the planes, deck tractors, etc. Hence it is not metal, and a bit rough at places but that is noticeable more in the close up images  
than with the naked eye, as I did a lot of sanding and smoothing in places. I have added extra detail in a lot of places, as the model was rather basic and was providing
just the general shape of the hull.
Kostas Katseas