Johnmknight has made a series of over 20 "realspace" small models. I'm guessing he is going to propose this as a future advent calendar idea on Cuusoo, since he has proposed a few real space sets on Cuusoo before. Maybe not, though, since several of these have more pieces than the typical advent calendar builds. It'd be a very cool calendar, though - maybe include a few figs of astronauts - even make them individual like Neil Armstrong, Yuri Gagarin, etc. Maybe Goddard and his rocket.