We have 3 cresties that need their adult home. Kallax shelves can't really hold 40 gal conversions as they did the 20 gal long conversions I made previous. So I made a plywood "cover" that could handle the weight. Birch plywood, edge banded and spray lacquer'd for protection.

Here is 1/2 inch 2x2x4 PVC enclosure setup I did. The pics with the holes was me creating a template to create the front opening using a router with a templating bit.

Show everyone what you make! This is dedicated to showing what you've made and helping others embark on the DIY journey! Here is an 8 footer I made for our coastal carpet python. Plywood, all sides table top epoxied. Glass sliders.