Great shot where he has his foot on the spare wheel , I reckon though I will have a bit more bodywork than that style so not possible for me.Thanks for taking the trouble to photograph this , as you say close to what I wanted to do.Just for reference if you decide to go that way I took a pic of my Chevy, I thought the box was nearer the shackle it but it doesn't look too far off what you had mocked up with the ply bracket.
So if you decide on that option it may not be any worse than mine so too bad after all, although your single leaf spring will move much more.
The current steering box is inside the spring pivot at the front , however I can't achieve that if I move it to behind the axle as it would have to be mounted below the chassis and would interfere with the spring , so it would have to be behind the spring shackle if moved to the rear.
Your description of the Chevy was very comprehensive and gave a great insight into car handling pre WW2 , I certainly want to capture the looks of the 1910's sort of pre-Blower Bentley however I don't 'need' to degrade the Sherpa handling to that extent.
Although in all honesty the Sherpa is very 1950's in execution despite being designed in the 70's !