I built a VERY sturdy play "fort" for my children about 20 years ago. Four upright 6" x 6" x 16' treated posts set 4' deep in concrete. Footprint of the "fort" is 8' x 8'. Floor of "fort" is 5' off the ground. There was a sand box underneath. I'm thinking of turning it into a chicken coop/run combo. I would enclose the sand box area with hardware cloth and install a door. I would build a ramp from the sand box area to the floor of the "fort" so the chickens could walk up to their coop. There is already a slot in the floor, next to the wall, 8'L x 22"W for the ramp. Would chickens climb a 6'L x 22"W ramp to the coop? Would that be too steep? If necessary, I could even build a landing 2.5' high in a corner with the first ramp to it, then the second ramp could extend to the top floor. That way each ramp would only rise 2.5' in 6'L. Would chickens climb 2 ramps 6' long and 22" wide?