I started off with polystyrene boards -
Dow (Common: 2-in x 4-ft x 8-ft; Actual: 1.875-in x 3.937-ft x 7.785-ft) R10 Faced Polystyrene Foam Board Insulation
Then I started sculpting. I used an electric chainsaw.
To make sure every was symmetrical I made a paper pattern. Besides the chainsaw, I also used an orbital sander
It's messy - the Shop-Vac made many repeat appearances.
Starting the cut down
Masking up is important - I used saran wrap to protect my eyes from all the super fine polystyrene dust
More cute down and sanding
Starting to add the planking - I used Wood Grain Floor Mats Foam Interlocking Mats Tile 3/8-Inch Thick, cut into one piece for the bottom and top, and two inch wide for the sides
I ended up using about 4 boxes of 1-lb-Gauge 1.25-in Bright Steel Underlayment Nails
I used a small amount of Gorilla Glue for each plank, and nailed the planking in. The planking conforms to the shape of the ship that way and the nails won't pop later on.
I decided to "tar" the ship to fill in any gaps, to give it a proper blacked and weathered appearance.
I used a small amount of black oil paint, Tile Flooring Adhesive, and then after it set, I covered it with Mod-Podge
Because I wanted the ship to hang, I added Heavy Duty Picture Hangers with D-Rings - One, Two, and Three hole ones - and used 3 inch long smooth 16-gauge sinker nails so that they would hold weight.