Re: practice
I'd build a trailer, set it at a distance and shoot into it. Maybe even put up a "wall" of plexi-glass or something so that u have to practice shooting at the same height as the wall during competition. Then, I'd put it on wheels and try it as a moving target (attached to chassis or old robot **mentioned above). If u turn it into a competition (person scoring most goals gets something) there might be more motivation for everyone to give it a try.
good luck
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