Update #2 - Merchant M15B
This ship represents medium-sized, modern motorships. It's loosely based on the composite superstructure version of the Doxford Motorship - a standard design produced by England and available in both composite and split deckhouse versions. They were popular replacements for the slow, coal-burning merchantmen that dominated the post-WWI British merchant navy. Several were built for foreign buyers, including Portugal and the Philippines.
The model took only about an hour to make; it was pieced together from a modern split superstructure cargo ship that I am also working on (designation M14B). These ships in turn also share parts with the British-style medium tanker I posted screenshots of several months ago.
BTW, I highly recommend using S3ditor for ship modeling - it is wonderful to be able to move nodes & components with a visual reference, instead of using guesswork. S3ditor also never corrupts data files like Pack3d sometimes does. The one major advantage of Pack3d is that it's good for importing obj files with multiple subparts - for this reason, I switch back and forth between pack3d and s3ditor depending on what I'm doing.