I was way overdue on building this toddler bed for my son. He really motivated me when he started repeatedly climbing out of his crib. The bed was very easy to make. The three things I would recommend are:
1. Do not use pocket holes on the footboard, so you don't have to fill all the holes. The nails worked great on the footboard and it is very sturdy.
2. Attach the side rails to the end board on the outside, not the inside. I found this out the hard way and had to take it apart and fix it.
3. Listen to Ana White and measure your mattress first. My son's fits, but I have to squeeze it in a little.