George-
I have some that are associated with our building products. All are designed with an extra 1/8" all around so they can be aligned/affixed from the back of the window opening in the elevation. Our window kits are typically two pieces. The pieces peal and stick together. The rear piece also has adhesive transfer tape on the back so it is easy peal & stick to your glazing material, then knife around the edges. You can paint the frame and trim pieces separately with different colors and then stick them together for a real clean two-tone result.
A couple of our newest projects have three layers for the windows. Two layers for the window trim and frame and a third for either a cast stone field or separately colored frame, specifically a red frame around a brick opening that contains a green window.
They can be found here: https://www.toddarchitecturalmodels.com/shop-2
If you need something specific- let me know.
