My First Snake Rack Ever!

[LunaBalls]

Hello everyone!

I am happy to get back into the hobby, well, it won't be until another month, but I wanted to be prepared.

So one Sunday morning, I was bored and looking for something to do, and I said to myself "Hi, Let me build a snake rack." I have been thinking about getting back into the hobby for a while now, so I figured this would be my perfect excuse to slowly start my collection. So I walked into Target, asked for a piece of paper, and started drawing my blueprint after finding the tub size I needed. Right after my visit to Target, I drove across the street to Home Depot to purchase the wood, in which they cut to my needs. So now, I have my beautiful snake rack (I'm proud) with minor imperfections. To reduce cost, I decided to go with plywood, per my research (quick search) AFTERWARDS, I realized that plywood was not the best option(for heating purposes), but I could seal the wood with a water based sealant (I will be using a Mini-wax Polycrylic Protective Finish) to withstand the heat. Now, my real issue, is that there is a small gap on two of the levels, the very top one and the very bottom, I would like to know if anyone would have any recommendations on how to fix this. I was considering of maybe using a very thin piece of pegboard, but I'm not sure if they are even made thin enough.

Any recommendations?

I am super excited, and can't wait.
PS: Happy Holidays