I am about to build a small rack, and I tell ya - the tolerance for a small Colubrid has to be so much tighter than for a Ball.
I will probably end up using lids, as I have a small Corn who could escape even the smallest crack. I will only have 3 tubs - 110 qt - so taking each one out for maintenance won't be a big issue.
I am combining display with rack ease. Only a few more things to purchase before I put it all together. Will start a new thread when that happens.
Thank for all the great racks posted here. I have gotten some wonderful help from them.