This is a simple ladder I made a few weekends back. It's made from five inexpensive pine 1x4x8's and half a bottle of gorrilla glue. Two of the 1x4's make up either side No dado cuts - just using miter saw at a 15 degree angle. One of the boards cut into pieces that allow for a 12" spacing between the steps. The steps were glued and screwed to the ends and each support piece was then laminated in between the steps The bottom step was 15" wide, each higher step is half an inch less wide. Levelled out and finished up with some sanding. Total cost about $45.
I'd like to add some kind of bumpers at the top.. a shaped piece of urethane would be nice.