Now that my responsibilities for making the casts have been discharged I am pressing on using the styrene masters I had made for the moulds. Unfortunately, this meant that the primer which was applied when checking them for imperfections had to be scraped off before styrene cement would adhere properly.
The next step was the helicopter platform and the top level of the superstructure. I opted to make the curved bulwarks around the corners of the superstructure from strips of 10 thou. styrene, pre-curving the strips before gluing them on. It may have been easier to get the curve accurate by using strips of brass.
There are ventilator outlets to be added under the helicopter deck which are not very clear on the plans, so reference photos provided the answers. There are also several doors made from 5 thou sheet to be added as well as stiffening brackets and small platforms . The brackets were made from strips of 10 thou. sheet cut to the correct depth but a bit longer than needed. Fixing with styrene cement creates a surprisingly strong bond for such a narrow contact area, and when it has completely set (ideally overnight) the brackets can be trimmed to length with scissors and then to the triangular shape with a scalpel.