Cement the balsa B-2 atop B-1. The rear edges of B-2 should be flush with B-1's rear edges. The front and side of B-2 should over hang the windows and windscreen.

Fit the upper cabin sides to the hull. Note that the upper cabin side must be cut away slightly in front to clear B-1 and B-2.

Place the 1/16 ply upper cabin top on the superstructure and draw a line across it above C-1. Using a sanding block taper the top of the upper cabin top from C-1 to the front edge. The top should be 1/16" thick at C-1 and paper thin at the front. Cement the upper cabin top in place.

Cement the upper cabin top in place.

Roger's Notes: The 1/16" ply will take some time to shape. 

Roger's Notes: This shows you the upper cabin sides attached.  Note the gap in the cabin top.  This is where the balsa piece goes.

Cement the 1/16 x-1/8 spruce trim strips to the top of the upper cabin.

Fit and cement both B-3's in place.