Here is a small investment I have been doing (cheapo on ebay), a circular cutter which is really very useful to cut out some 1cm+ holes in plastic. Sadly, the thing is that this tool is designed to cut out paper. It won't last long with platsic and then I have to find a supply of blades..
Anyway, here is the hole where the turret will pop out.
I glued the plate to the boat's skeleton and here we have the upper part partly done.
i will have to create the window's sides before being able to glue the other part.
Now I will have to start assembling the lower round part.
After that will stay the harder thing to do: the damaged metal plates.
oh yes and some riveting too!