Large stage should have about 270lbs at 350 psi. Small stage is around 70 pounds. And with two cylinders I hope the large stage goes up first and it should then middle and last small rod. And I'm going to have to play with pressure, if I don't need it that high I'll back down to minimum I can get away with.
Some more work.
The small tube is for retracting and hole is for extending stages.