When I had to move into the home place and care for my mom, I built an indoor shooting range in the basement. In one part I had 30+ feet of unobstructed space. I put a large home made backstop at one end and a small table and chair at the other, to hold all my shooting paraphernalia. I should note that I only shot air guns here, so as not to disturb mom. Well, walking back and forth to check my targets got boring, so I bought an electric train set and lots of extra track. My "layout" was a simple oval on the floor, running from my shooting table to the backstop. A home made target holder was attached to a train car. It had to be high enough to be the right height in front of the bullet stop. That train made many a round trip with it's cargo of one target. So, I combined two hobbies and was great fun while it lasted.