: If those five more maps are just to have a scenario that is five maps bigger,
: and they aren't really needed to carry the story/experience of the game...
: just skip them and release anyway.
: And if they are needed to fullfil a specific story purpose, I doubt anything
: on the Orphanage will be specific enough for your needs, though you might
: be able to adapt something.
It's especially difficult to have a good story unless you're making the maps, because a good story is very thoroughly entwined in the maps: the map needs to reflect the objectives stated, and the objectives stated need to jive with the rest of the story. It's not likely that you'll find that perfect map on the Orphanage unless you're looking for a "filler" level ("okay lol time to kill a pfhor ship"), and in that case, you can just dump the level.