The crib side is back on. It didn't last long, and at least it is very easy to switch from the crib to toddler conversion and back!
He enjoyed playing in it.
Looks like this wasn't the answer to our sleep problem. I actually feel kind of dumb for even trying it. Oh well. I can say I tried right?
I ended up taking out the bumper - since he has been trying to climb up it he has broken the ties off several corner anyway - and gave him a comfier pillow. Maybe that will help some.