After your corn escapes, you will simply have a very pretty, but empty, terrarium. Read back and see how many people have escapes. This is a lot more likely to happen with a bigger enclosure, because they are usually not built as "tight" as smaller ones.
I cannot stress this point enough.
Make sure it is absolutely escape-proof.
Be aware that your little corn will be able to climb up glass, or other smooth surfaces and get about half an inch shy of his entire length! All it takes is getting its chin over a ledge and it can pull up its entire body.
Also, know that their heads and entire bodies can squish and flatten to get through very small cracks. A hatchling corn is a little thinner than a pencil. They can fit through a crack (between the tank and the lid) that is only half that wide.
For example, I had a 4+ foot ball python, as thick as my bicep, and her favorite "hide" was jammed between her 'hide box' and the wall... in a crevice 1/3rd as thick as her body! Between that and eating, they will amaze you with what their bodies can do.
I've been keeping corns for over 4 years now, and I've had a CalKing since 95. Of these 15, I have had
zero escapes over the years. It just takes foresight, and making sure you don't underestimate your opponent.
Ok, I'm done lecturing.