The first adventure is a Sword and Laser version of en.wikipedia.org/wiki/Treasure_Hunt_(module) on an asteroid instead of an island. the magic barge at the end is an escape pod on the asteroid.
Upon the end of that adventure the pod idles, floating in space, after fiddling with the navigation computer, sets it to an derelict starship factory ala www.goodreads.com/book/show/283627.Palladium_Books_presents_The_Robotech_RPG_book_six_The_return_of_the_masters. The factory is damaged to the point that it will take 132 years to be fully functional again, however it has enough materials to whip together a small 11 man crew damselfly class starship in the days, unfortunately that's three days dodging a rouge shoggoth.
After that second star to the right and straight on until morning