GIMP 3.2.4 Scripted Collage & Montage

I need two reusable scripts for GIMP 3.2.4—one that assembles a photo collage and another that produces a classic montage—both finishing with a single overlay image set to 50 % opacity. The source images... (Budget: $8 - $15 USD, Jobs: Automation, Digital Art, GIMP, Graphic Design, Image Processing, Photo Editing, Python, Scripting, Software Architecture, Visual Arts)