maybe now is a good time to start making cheap wooden ladders to ship south of the border
a good time to start the conversation on methods and techniques and materials
kiln dried douglas fir comes to mind first
light and strong
but for the treads traditional dowels might not be durable enough
i think bolting the treads so the edge is stepped on is the quickest way to go
this way no material is removed and hence no cuts just drill then glue and bolt
nut and bolt so that they can be tightened and loosened for quick assembly