I just layered out the little acrylic diamond shapes onto sticky paper cut to size. I had to kind of fudge the pre-cut (!) (thanks Mark!) pattern here and there to fit into the actual bay window opening. I squeezed (squoze?) clear paper glue into the gaps between the shapes and will see if that might hold it somewhat in place. I first thought to use hot glue but then thought I'd try paper glue first as I had more sensitive control when applying it. Tomorrow I'll adhere previously made leading strips to both sides of the gaps and see how that works/looks.
All the tiny scratches I made from pulling off the acrylic's protective blue film, all the paper glue that I smeared onto the shapes while trying to tidy up the seams, and all the non-uniform spaces between the shapes, will make it look--homey? It's true, I would like the finished window to look as hand-made and rustic as the rest of the set rather than like a precision model. I intend to add much dirt and dusty filmy patina to the finished cottage windows anyway. My sloppiness will add "character".
Planning on posting large tomorrow.