I dunno, does it? I was involved with trying to steam bend some ash in about the dimensions you're working with (E-2 Cub wing tips) and the steam box came up short. In the end we wrapped it with wet rags and poured boiling water over it as we slowly drew in the clamps against the form. On the other hand, I do know of some wing tips that have been made with about 1" x 1/8" strips that have curved two ways at once.My bottom longeron has a compound curve. How would you laminate that? Out of a bunch of 1/4x1/4 strips?
When you consider that, steam bending looks better, doesn't it?
I guess the real question is what did the other J-1 builders do?