Hi, in this video i tried a little slingshot at mun with my 600 tons cruiser on it's way to the Jool system. Perhaps i choose a little low periapsis (about 4500 meters). So you got me screaming, quieking and praying (sorry, in german language) while passing a higher mountain in ...ahhhh ...not much meters. ;-). The interesting video part is between 20:00 - 25:00.
Have fun! p.s. Sorry for any english language errors, it's not my mother tongue