Make up the water tight doors and add them to the superstructure just before you add the color coats.

Make the foam nozzles from 1/16" rod and paint red. The fire axe was made from a piece of 1/16' rod with a piece of tin can stock soldered on for the blade.

The twin .50 mount is an inline tripod of 1/16" brass rod. The boss on the underside of the ammo boxes was drilled 1/16" for the center rod of the tripod. The machine guns are epoxied to the ammo box holders.

Make up the life ring holders from aluminum can stock as shown in the detail drawing.

Install the windows (clear plastic) on the bridge after painting. It's a little tricky but it can be done.

The rest of the deck hardware should be pretty self explanatory. Just find the locating dimensions on the drawings and fasten the part to the boat with your favorite adhesive.