That was my con, stressing out the snakes when I opened the tubs, and yes, the shelf would be the top.
I didn't think about accidentally closing the shelf on them... I need to actually see something in front of me to know how it'll work. xD
Much thanks! I think I'll just make two separate shelves. xD Make my life easier. Or see if I can find a shelf that fits tubs for both adults and juveniles. =)