I will be using more of the 3 x 3 polished stainless angle on the corners. I will wait until the box (living quarters) is welded to the lower unit. The corner trim will run from the roof to the bottom of the lower unit in one piece. I am using West Marine multi caulk sealant under the trim. I am using #8 screws every three inches. I drilled through the fiberglass layer of the FRP to prevent the sheet metal screws from cracking the gelcoat. In one of the pictures you can see the small screw holes and when I apply the caulk I run a bead over the line of holes. When I install the screws a small amount of caulk goes around the screw for a water-tight seal. The large (3/8 countersunk) bolts get covered with caulk. The last piece of trim will be what I call the belly band. I will screw a 4" strip of stainless around the box to cover the joint between the top and bottom. The belly band pieces will start and stop at the corner pieces. If all goes well it should give a finished look.
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