Time for a big girl bed?

My dad made my daughter's crib. He read tons of articles, magazines, etc. before doing it, and he is an amazing woodworker. This is a picture of the crib

Today Delaney figured out how to open it. On each side is a slide lock that you just push in place to lock it. After changing a dirty diaper, I locked it quickly so I could go throw the diaper out and wash my hands. By the time I got back in the room (from the bathroom across the hall) she had one side unlocked and was working on the second side. I think we might have to remove the front railings (my dad also made it so we could use it as a toddler bed) and go get a bedrail. I don't know if I'm ready for a kid that can climb out of bed when she pleases!