For instance, If you live in a city and have about 50 square yards of front/back yard, your not going to make a loud combustion that can shoot 200 yards. For one, the noise would piss-off your neighbors, and two, people don't want potatoes landing on there houses 5 blocks away.
But if you live in the country, and have a few acres of land to yourself, you are pretty much limitless to what you can make.
I am lucky enough to live in the country

Here are some pictures of my palace

Top view of the whole lot

Another picture from a different angle

Well, you've seen mine...now show me yours! lol