This paddle boat is comes with either a screw or a pulley wheel to wrap the rubber band around, depending on the width of your rubber band. It has two sections to hold pennies. Glue is required to attach the wheel to the axis, the 2nd cylinder to the axis, and to attach the corkscrew/pulley wheel to the axis. These three objects are other's that i used in my design: screw- Thesaint7811 pulley wheel- alisonleanne washer- PetehagorasI started with body, creating a box with and open top.Then I added 4 hollow balls to the body. The holes on the top are there to release any of the resin that gets caught inside. I then created the wheels using rectangular prisms and cylinders. The axis is shaped strangely so the wheels would have a better grip. Using the subtract tool, i created holes in the body of the boat and with copies of the axis, made a hole in one of the wheels. The other wheel i attached to the axis. I then added a hook to the front of the body. I used washers, a pulley wheel and a corkscrew from other people's projects (listed in sources) and resized them for my project. The corkscrew and the pulley wheel are interchangeable depending on the width of the rubber band. Glue required to attach the wheel to the axis and to attach the corkscrew/pulley wheel to the axis. By suggestion, I have added a cylinder on each side of the wheel to fill out the holes so it would spin more smoothly.