In the spirit of poking fun at all the flex pictures, I was thinking that I need to fabricate a square tube "spring" and then use either a long buggy spring or a shackle on a long pivot arm. I think it would still provide great flex to post on this thread, but it wouldn't ride very well.
The bottom line is this: If you get great flex with a spring that you can safely use on the highway (this is why I like the Marlin and Alcan type of lifts) without buggy springs or revolver type shackles, I am much more impressed. Nothing wrong with the other stuff, but it isn't that difficult to get a spring to drop away from the frame. I will admit that the steering in the front takes the difficulty to the next level.
Great Pictures!