DIY Reptile rack for a decent price? :) Tell me what you think!

Here are some picture of a rack my boyfriend and I are currently working on for our leopard geckos.
It's been pretty inexpensive.

I do have a question tho. The holes we drilled on the top of the container is 3/8" are the holes big enough and are there enough holes for the air flow to be okay?

-Plastic rack (I had laying around)
-8 Containers $35.00
-Heat Tape (https://www.reptilebasics.com/) $32.80
+THGHeat Wire/Clip/Insulator Set for heat tape connections
-Foil tape $4.00 (Amazon)
-Thermostat (Zen Cart!, The Art of E-commerce) $103.50
We wanted to play a little extra for a thermostat that will last us a long time and be reliable.

Also, YES our leopard geckos are WoW themed!
Hope you enjoy.

Sorry the pictures came out at that angle, I don't really know what happened.

Looks good to me! Very nice