I'm just watching an old British film called Mouse on the Moon.
Starring Bernard Cribbins it tells a story of glory and fibs. The tiny state of Grand Fennick wants to send a manned DIY rocket to the moon. There's plenty of good old-fashioned buffoonery and Heath Robinson rocketry!
Reminds of those other DIY space mission movies full of eccentrics from the Sixties. The First Man in the Moon springs to mind with a bumbling Lionel Jeffries.
Can you think of any more films like this?