I previously put the cabin crew module right at the top of my rocket, followed by computer, then fuel and engine. I lifted to orbit, collected one stranded Kerbal in orbit halfway to Mun, then went into Muner orbit to collect another. It was very early in career mode, but I think I turned a very tidy profit from the mission. I landed it with 2 radial parachutes (or maybe 3, I can't remember!)