I wanted a bunk bed for our daughters, it needed to be easily moveable like the "classic bunk beds." I also wanted stairs like the "Sweet Pea Garden" bunk bed because we have toddlers in the house. I modified the classic bunk bed to put the ladder on the end, then built the Sweet Pea stairs to fit to the opening (I think the only difference in dimensions was a 20" top stair. I didn't want the unfinished ends of plywood so I got 4'x16"x3/4" pine boards from lowes which happens to be the width of the stairs in the plan. Instead of using the 1x2's as trim on the ends of the shelves I put two of them together, one all of the way down the front of each stair and one resting on the top of the stair (screwed together) so I wouldn't lose lateral stability. I then spaced 2x2's in between to keep it "simple" looking instead of the heart shaped decorations from the sweet pea bed. I used some 1/4" paintable composite board to provide a backing to the stairs. I bolted the stairs on to the bed with some flat bar stock cut to size and 3/8' in hex bolts cut to length. I used pocket hole joints wherever possible and countersunk all other screws and used 3/8" dots from lowes to fill the holes. I painted it with a coat of primer and a coat of Glidden Trim and Door paint in antique white from the Easy Vintage Step Stool project.
Kilz Complete Primer