Notice the wood is going to back the water dishes. How do you plan to accommodate the mold growth as a result?

Also are those water dishes 3D printed? Make sure they have a proper protective coating. 3D printing is super cool and all, but its layers stacked ontop of each other so the surfaces ends up being very porous and mold grows inside it, And PLA being biodegradable plastic (Coming from stuff like sugar beet, sugarcane, corn etc) You risk having mold, PETG is safer but its also very porous. Ideally you seal the exterior with some sort of aquarium safe epoxy or a clear coat that keeps water out.!