Now comes the hard part on some liveries. It's pretty straightforward with this
one though. The titles and registration for the top fuselage need to be
reversed. (The top side should always have mirrored titles) First, select them
with the rectangular marque tool. Press command-t to transform, right click and
hit flip horizontal. Deslect and match colors as needed:
Only the right side of the plane should have cargo doors, so I'll clone them out
for the left side.
And we're done! The paint isn't at all perfect, but I hope it gives you an idea
of how to go about things. Thanks to everyone who's given me feedback on this.