Hi, sorry it took a couple of days to respond on this. Here is the thread that talks about the build: http://www.sawmillcreek.org/showthre...9-Crib-Project
It shows the hardware I made from aluminum flat stock to attach the mattress support to the frame. I made the top front rail about 3" taller than the in store measurement I found. This was based upon a design sold in several stores called the "Peyton crib." I believe that the Peyton crib can be found on Google 3d warehouse. I also made a plan, but caution that I actually varied from the plan a bit on the fly so it isn't totally accurate.