Harv,
Feel for you on that drill getting you, I was putting a hitch on my dad's truck and he handed me his 1/2" 18V dewalt saying, be carefull it really has some tourque. Opening up some holes in his frame with a 1/2" cobalt bit, I found him to be correct, drove the back of my hand into a protruding bolt on the frame and took months to get to feeling better.
That said, on some of the pictures, there is something on the front roof of Iris, I think it looks like a winch cable running over the top to the Gin Pole?
Am I seeing things or is there some support there?
Have you ever had a problem with Iris and that singel sided arm?
Thanks for positing the pics, they really are an inspiration too me.