I like this ship anf I would like to see a good result!
First of all there are a huge number of "dark grey" pixels instead of black (RGB 0,0,0)
I just converted the good black pixel into green... all the other lines and/or pixels aren't black.
Moreover pay attention to double black lines that should be avoided (look at SB tutorial)
The hull stabilizer isn't a line...please look at the "equipment" sheet and correct it
last suggestion: the truck with crane isn't out of law... it must follow the SB standard (black circle around tyres,...) and, please, a little more details