Thank you for your offer, but you're right, doing this myself would be the correct way to go. FWIW, I've been using Orbiter 2016 and starting with one of the stock XR-2 scenarios (Ready for Takeoff to ISS). From that point I've deleted or added LOX or fuel as necessary for trips to the moon or Mars, but it's all been by trial and error (land at Brighton Beach with excess fuel? OK, next time start with less). It's just that I know there's a way to figure this out while on the ground, and I would enjoy doing that. I can get to the moon or Mars using TransX or IMFD without issue; I just want to learn how to do it efficiently. Texfilms has some great flight planning videos (good discussion on his Saturn planning), but the link he provides to the spreadsheets he uses doesn't work. As you said, it may be best for me to plow ahead and do this on my own.