Circular stairs for the people access and a traveling crane running off an extended peak trolley works for me. An 8 x 8 trap door under the 2nd floor deck at the main 1st floor sliding door give access to the crane head.
I'm planning on having a traveling crane out one end for heavy things. Lumber and plywood don't lend themselves to cranes, easier to have a decent stairs to carry it by hand. I've thought about a circular staircase indoors to save space.