I like the simplicity of the rat trap but I think on a rainy night it might not be loud enough. I want first alarms to be 100 – 200 yards away to give me time to see and evaluate the threat without being seen. Looking at the 12 gauge alarm, I think I can make them using pipe cemented into the inside of a section of 2″ pvc pipe. I’ll see what size copper pipe can be used for a brass cartridge. i have a lot of empty brass cases that would make it easier than a 12 gauge hull.
I have 50 lb SpiderWire fishing line to use as the trip wire. It is solid dark green in color and is really hard to see in the woods or grass.
I’l take some pics when I get to it.