Looking at the below images, the chief and marginal ray appear to be modeled just fine.
But, those lines don't seem to conform to the rules typically used in thin lens ray traces. An example of which is below:
(source: rjones at boson.physics.sc.edu)
The video below describes the nature of the chief and marginal rays. It says, among other things, that marginal rays start at the bottom of the image and chief rays start at the top. It even passingly describes the exit angle of the marginal ray as being a function of the F-Number of the lens. The problem is he doesn't go into much detail and I havent been able to corroborate the equation with another source.
Provided you know the diameter and focal length of the lenses in a system, what are the rules for ray tracing the chief and marginal rays? If its even possible.