A reader of the Bron Hebog Facebook page asked me how I was going to make the master for the guard's look out duckets on 11 & 12 so I thought I should show you some step by step pictures.
Instead of trying to carve the curvy shape out of a solid block I prefer to build it up with a framework with a thin styrene skin over the top.
In the first picture below you can see I'm making it up on a thick section of styrene because it's going to be used as a casting master.
I'm using 0.60" seize styrene and I've laid out the formers for the flat, square upper section of the ducket.
The bars on the outer edges of the top section are inset because this is going to form the tiny window opening - you'll see the effect when the skin is placed on top.
I've quartered a piece of styrene tube and glued that along the top - with a slight lip - to represent the tumble home at the top and the very bottom bar has been shaved a little with the blade of the scalpel to round off its edge.
Next I glue on a 'skin' to the exact same width as the framework.
It's quite thin. I've chosen 0.10" sheet. You'll see why in a moment.
You can also see how the window opening is there now.
In this last shot which shows the completed ducket you can see that I have pressed the tail of the skin down and glued it to the backing piece to form the distinctive curvy profile and chopped it off at the bottom.
I have also added some thin beading strip and filled the gaps with Milliput.
Now it's ready to have a box built around it and be covered in gooey moulding rubber mix.