I did mine the easy way, I purchased an 8X10 shed from a local builder and set it up in front of my backyard range. It is now a little different than what is pictured as I have a space saving wall hinge mounted folding bench under the window that is lifted into place when I am shooting. I have one of those little buddy heaters hooked up to a 20lb tank to keep things warm when it is cold. I do quite a bit of handloading in the winter and it sure makes it nice to go out and shoot and test when the weather is not the best and helps pass the long winter blues.
Al