I am not sure this idea will give you the safety factor you are looking for. I am not an engineer, but it is my estimate that the studs in the corner will take the majority of the weight. While the studs on the outside of the corners will take fractionally less weight.
Additionally, I would want to see the i-bolt go all the way through the stud and have a large washer and nut keep the i-bolt from coming out of the wall.
When you use your hammock stand don't you get a lot of inward deflection of the uprights once you lay down, which in your application would result in a lot of cracked sheet rock. I am not convinced that the method you are considering is safe. Especially if you have no idea on the integrity of the construction and its ability to withstand the dynamic stresses of you moving in your hammock.
I do like the idea of creating a safe indoor hanging method!
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Hunter S. Thompson