Hey Rich... I'm an ESB guy so I really don't know much about ROTJ Fett. I would check out the templates made by RafalFett. As for experienced painters who've done ROTJ paintjobs... PM fett4real, slave1pilot, and stormtrooperuy. s1p I believe uses an airbrush and probably the correct colors, f4r I believe has used both airbrush and rattlcans... they have both painted on commission so their input will be valuable... and stg even has a thread here discussing his rattlecan color choices for ROTJ.
Good luck!