If you use Egg crate you can make a lid with a HOB filter or overflow to add a sump. I prefer the use/function of a drilled tank, so if money was not an issue and the glass is not tempered, that would be my vote.
For sale. Lightly used Pico Pro. Color White. Used it temporarily before moving to DFW. Asking $100.
Link for specs- https://premiumaquatics.com/products/picopro-black.html
Ive always loved tiny Picos like this. But never can find a clear "tank". Bought a Pico Pro for a 2 gallon jar tank but the glass is always blurry on everything i see. this one is beautiful and clear! Totally jelly.