I made these using copper PLA and white pla painted with a chrome sharpie. The elastic strapping was purchased on amazon. I weathered them using black paint, I'd paint it on lighty with a brush and then remove it with a moist rag, it would add some patina and make them look worn and weathered. I need to weather the screws a bit more but I'm waiting on different paint for that. The screws are 6-32, I've also found M3 screws will work but depending on the head they dont all fit flush. Reminder, assemble the whole thing and then do the weathering, that way it looks more authentic and ties all the parts together.