Well, I did think about Gemini and Apollo (I'm probably half way between Mercury and Gemini). I'm sure, like NASA, do stuff like that on my way to the goal. But I think it will work better if I have a goal. What do I do, just remove the capsule and drive the top stage into the moon? I think I can reach them. Though its a puzzle. My current ship will do an eccentric orbit with an appogee of about 1,500,000 km (perigee 100 km). (I haven't tried to see how big a circular orbit I can do because there is more likelihood of stranding my astronaut if I don't keep proper track of fuel.) But I was also judging rocket power by see how far straight up I could go. That last one put him into solar orbit. But I really don't understand how I could manage that if I'm limited how high an orbit I can get to. Doesn't escape velocity require more delta-v than any orbit?