Well sorry, can't agree with that. Take for example the hawks on s2. Hawks really don't represent J-2 engines, broadswords would be better. Also, the number and arrangement of engines on S1 and S2 should be identical, but here there's 5 on S1 and 2 on S2.
That being said, I do appreciate the effort it took to create a Saturn-esque rocket with no dlc.
Also the twr could really be lower.