This book got me back into KSP and this challenge made me register for the forums so thanks. I just finished re-creating a flight plan kinda like Hermes. I have a ship that just left Duna at Universal day 72 (I had to turn off kerbin time to work with PLAD's FlybyFinder, thanks for that PLAD). The screenshots are from a couple days after it left Duna's SOI. It then does a flyby of Kerbin, then back to Duna, then back to Kerbin for a close approach. Currently the plan has 2 maneuver nodes, one for 1.8 m/s just to trim stuff up and then another right after leaving Duna the second time for 85 m/s but I'm pretty sure I could get that way down just by trimming the Duna flyby way earlier. I tried messing with it and the paths kept bouncing all over the place (asking the engine to plan out over 200 days with 5 planetary SOI changes is a little taxing I guess) so I left things where they were while I got the screenshots. http://imgur.com/a/1DQam Next step is actually flying it, we'll see if it works :-)
