I have almost completed the rack I was building. I am currently testing humidity inside the tubs to see if I need to put in holes, but other than that, it's pretty much complete.

I am afraid to put snakes in there though, because I am worried that they can escape, as this is the first rack I built. I have never pulled tubs out of other racks, but I tend to think that the tubs I built tend to be on the loose side. There is a small gap between the board above it and the tubs, which I believe is normal. The wood is also laminated with smooth material which makes it very easy to pull out. I just don't know if the snakes can put their nose at the little gap and slowly pry themselves out. My friend said it should be ok, and if I am worried to put a small piece of metal that I can use as a "lock", but since there is some space on the left and right too, I think that the tub can rotate so that a corner is out of the rack?

How can I test the rack to see if the snakes can escape? I have the rack in a herp room which has lots of places for the snakes to hide if they came out... (I know but its the only place I have to put it) I guess if I put a snake in the rack and observe it, but I have had experiences where the snakes did not escape from an enclosure before but did weeks later, so... How would I know?

Or am I just over thinking this?