Thanks for posting this, I was having trouble making a lifter to get 206tons into orbit, mainly because it is tall and parts kept exploding on the launchpad. I love the stablizers you have under the engines. And also I don't have that much time to devote to design atm due to school assignments, just wanted to get my payload of a Kethane lander with interplanetary stage to duna and kethane/ore scanner probe (the ore is for extraplanetary launchpads mod) to Duna. Your launcher got it into orbit! I had to modify it some by adding some extra liquid fuel tanks on top of the orange tanks though, and bunch of solid rocket boosters to get above 4500 delta V to get in orbit though. My payload in orbit with 622 Delta V to spare on the Leviathan stage =) Thanks again! The modified lifter taking off: