When we were building rockets, we designed our rockets, and they would have a payload inside them (an egg), and you would have to design padding and a parachute for the rocket, so the egg wouldn’t crack upon landing.
In the simulated missions, there were Mars, lunar, and orbit missions. I had the opportunity to do the orbit mission as well as the lunar mission. In the missions, there were people in ground control, and there were people in the spaceship, performing missions, e.g. landing on the moon or doing experiments in Mars. Ground control and the people in the spaceship communicated with each other at all times.