I've now got all the screenshots I need to complete this. There are 50 invasion routes in mongol conquest, and 106 in world conquest, so it got pretty involved. Savestates, as well as an in-depth gamefaqs guide with all the borders, helped alot. Putting it all together in Pixen should be fairly straightforward.
As you may have noticed, there are already maps of this game on gamefaqs. But there are two important differences:
1. They are diagrams, while mine are in-game graphics, and
2. My maps have the staging areas for invasions, while the diagrams do not.
I should be submitting sometime soon. Is there any guide for submission, besides emailing them as .zips? I haven't found any general instructions.