I got a couple of sets for Saturnalia, including the lone ranger stagecoach and a red pickup truck. After immediately tossing the instructions and cannibalizing the sets for parts to upgrade already existing models, I began looking for ways to use the new pieces. This is one result I got using only pieces from these sets:
After messing around for a bit, I came up with the inspiration to build a steampunk fighter. Here it is with the wings folded down.
It can carry a pilot and a passenger, and also has clips to hold gear. The plane is powered by two rocket engines. The tail fin can move up, down, left and right.
Here is the plane with the wings unfolded. It has a a swiveling Gatling gun in the nose, as well as two heavier, but relatively fixed guns on the wings.