Well, everything looked good until the last pic. I'm thinking this might not work too well around these parts, as much as I'd like to try it. We have a lot of worm snakes around here. I was raking my hand through some loose soil one afternoon and came up with a worm snake dangling in my hand. I'm real careful now when running my hands through the soil, even if they aren't poisonous.
I'm thinking this would make for a perfect underground home for worm snakes.