My daughter loves her new bed, thanks Ana!
The plans were well thought out and very easy to follow. I did make a few changes/modifications that others might want to consider.
I used select pine boards to cut down on the amount of sanding necessary prior to paining, however that boards have a fairly sharp edges. Because this is a kids bed and play area underneath I rounded off all the edges with a 1/4" round over bit in my router. I love how it turned out!
I also added two 1x3 supports to the long 1x2 top back rail. I did this for two reasons, first was the 1x2 seems a bit saggy and didn't seem like it would hold up too well to my 6 year old up there. Secondly, it match the front rail nicely. Speaking of the front rail, I also changed the vertical supports from 1x4s to 1x3s. The 1x3s match the 1x3 posts and look much better IMHO.
When I built the ladder I was struggling with the gaps left by the 1x3 stair treads when I placed them in the 1x3 sides. Finally I decided to use 1x4 treads, again rounded over with a 1/4" bit. These larger treads overhang the 1x3 sides by about 1/2-inch and look very nice.
Finally, instead of screwing the ladder to t 1x8 bed frame, I bent 5" corner brackets into a "J" shape and attached them upside down to the top of the ladder. The upside down "J's" hook over the top of the 1x8 bed rail and allows the ladder to be easily removable yet is still securely attached to the bed for use.