These are the two sides and the fore and aft walls cut out and marked, along with a couple of trial window frames and the coil of brass they are made from (it's about 2mm x 0.5mm). The fore and aft walls are curved at the bottom to match the deck.

I am designing the detail as I go with this. I have a good idea in my head of the end result, but having done a few drawings decided it wasn't worth the time and effort to try and predetail everything. So there may well be tears before the end.