I did it by making two router templates; one for the latch body, and one for the bolt hole in the jamb. Started by including solid blocking in the doors.
Here are some links to my thread where I did a test to make sure the templates were good to go, and also where I cut the actual doors (work is interspersed with other jobs).
Here's how I made the router templates and the test mockup. Some hand work was needed for the final fit.
Scroll past the boat pics
http://www.tnttt.com/viewtopic.php?p=954475#p954475Scroll down past the cat, twice
http://www.tnttt.com/viewtopic.php?p=960938#p960938Here's how I cut one of the doors.
http://www.tnttt.com/viewtopic.php?p=1018869#p1018869