The strongback now has the upper clamp, opened/closed separately:   The clamp is sized for 2.5m tanks only.  In fact, I don't think I'll make alternate heights, this thing is like the shuttle pad in that it's a specialty part designed and intended for a specific rocket type. The clamp and umbilical group will have deploy-limit sliders for adjustment, but otherwise will be as-is;  a Falcon 9 is pretty tall to begin with, so there's plenty of height already. On another ma