LOL, I'm 72" so a bit shorter, and now a mere 260, used to be a lot more. slowly losing the excess. That fold-a-ladder thingie scares the Jimmies offa me. I hope that guy ya know is a magician. I can almost hear the scream from here as you, and 100 pounds of splat, go hurtling toward a cement stopping point. OUCH!!!!!!
How about an old fashioned pull down deal like Grizz (Clark Griswold) used in "Christmas Vacation" A lot of those still have weight limits of 300 to 500#, store up and out of the way. Any loss of floor space is on the top side, and it is minimal. No engineering required. I used to put in the extra wide ones, and my shoulders and an armful would easily pass by. Now they even have them with metal reinforced fiberglass steps, like a heavy duty ladder.
A lot of them found online,
but all of these are stored above your normal reach anyhow.