Yeah, it's complicated. The hardest things are the beginning and the end.
Getting the mission sheet to be presentable is the least of the worries. I have an openoffice "template" now. I created an IA symbol font, downloaded the Agency FB font. I use the Vassal IA Campaign module to build maps, Gimp to cut to size to import to the document.
I'm in the third iteration of The Cargo, changing the beginning (both map, entrance, and initial deployment positions) to speed it up, some cleanup of mission rules. Hopefully the next play will get the rebels closer to their objective as well.
On the other hand, it's a big map (almost all Core+Twin Shadows desert tiles), and allows different strategies, so there are limits to how much it can be balanced -- like all missions.
(Yeah, there are so many official missions I have not played yet that playing user-created campaigns hasn't been attractive.)
Edited by a1bert