I like theat groove and plex glass. I built wodden caged befoer and sealed the bottom with bed liner paint ( like rino liner) it worked great to prevent the wood from molding , and spilled water bowls( use silcon to seal he plywood and 2x4 frame together to make water tight.
I might try to make another one if I got the extra funds this summer ( like msot I see with the plywood only inside) but I will double wall the units so I can fill with expanding foam ot make it warmer and heat holding better .