I built this for my second son who was tired of "being in jail", he's almost 3. His older brother is now jealous!
Was a nice easy build - the hardest part was paint spraying for the first time! I would cut the slats pieces about 1/4" smaller to give a bit more wiggle room when lining up the pieces, and make sure to keep the headboard and footboard square when lining up.
The cost was higher for me being in the Bahamas. I used fir for the frame and spruce for the planks, why, I thought it would save some money but didn't really.
I used pocket holes to attach the bed rails to the headboard and footboard.