Interior
So planned the window fitting carefully.
After cutting the holes I started the carpet lining, used one sheet to cover the whole interior side. But the plywood panels I covered separately to allow me to be able to remove for maintenance but you see the photos.
Trimmed the carpet around the newly cut window apertures and then fitted knock on trim to cover the edges which made a nice neat finish as the trim fitted over the carpet.
Bought a set of curtains along with the tracks for top and bottom. Keep the light out nicely for the lighter mornings.