Last night I put the mouldings around the inside of the windows. As the windows are round, needed something that would bend but give a really neat finish. I've used Funky Foam for Crafting. It's really easy to cut with a scalpel and ruler and gives a lovely finished edge that can be painted over. You can also use it for the inside of a miniature book, just wrap the book cover around the foam.
Still got to put the acetate in the windows, but will leave that till last, just in case I get any glue or paint on them.
Available in Etsy shop
10 hours ago